I am 20 F and want to know about my relationship with 23 M

I am a 20 f and I met a guy 23M.I met a guy on a language sharing platform.i wanted to genuinely make platonic friendships and learn about the language.I joined the app but because most of the guys used to flirt and talk sexual.i was scared to keep the app but while I used the app I met two or three people who didn't talk anything flirty or vulgar.They seemed genuinely interested in having conversations and friendships.i wanted to learn the language but could not because I was having my entrance exams on the way .I deleted the app but before doing so I wanted to talk with those people so I kept their numbers and interacted through instagram and whatsapp.I met a guy on the app who gave me his instagram and his instagram was filled with photos of him with his gf .I was really happy that he didn't hide it and I considered him a safe guy friend as he had a gf .I met him 7 months ago on the app and then for 4 months straight I kept connected with him only through text messages talking about countries culture and history war civilizations but zero calls .It was interesting for me to be friends with foreigners.The conversations were only platonic and non serious but after 4 months of regularly talking with my online friend,I had developed a platonic friend attachment to him.it just felt like a diary entry as I had no calls but long text messages about my daily life ( friends , relationships and life .He wanted to learn English and was failing to do so so,I offered him to have conversations on call about normal things with me if he felt like improving .I called him once after 4 months of regularly chatting but this was only because I was going through a depressive day were I faced severe revenge by someone and I had zero friends in my dorm to talk to so I called and talked for sometime and after that for the next 3 months he used to call me frequently to talk so that he could learn the language and we used to talk in english about wars,food ,cultures but for me because I had absolutely no friends I thought of him as a really close friend and I used to refer to him as my brother and bestie .we never crossed the lines in topics and I used to always ask him to invite me in his wedding and always asked him to introduce me to his gf in order to check his intentions.During the 3 months as I had absolutely nobody except my parents to talk to I developed an attachment but I knew that he only thought of me as a language exchange friend .The attachment was platonic but I used to fear about it turning romantic in the future so I sometimes used to overthink about it a lot and I used to share this with my mother and used to pray if he could stop calling me but then again when he called me someday I asked him clearly on call about if in the future there would be any feelings or something of that sort and if the calls are anything unsafe for anyone of us crossing boundaries.He told me I was overthinking and that would not happen and guys and girls could be just friends.As he was an army officer who stayed in army camp i thought maybe he also wanted to have a geniune friend .I used to fear constantly during those 3 months of him calling me regularly because i felt I might develop feelings for him as I had only one friend that was him .I asked him if his gf knew about me and he told me she knew about me but "not in details "and I confirmed this with my mother if it was anything of concern and she told me maybe that this guy didn't share in details about me to his gf was because the conversations were nothing important or intimate so it was not needed to be told in details like that .I used to call him my brother and best friend frequently because I used to think he was for me a genuine friend and to make intentions clear I used to call him brother mostly (to bro zone ).I asked him if he would invite me to his wedding and he said yes.i used to tell this inorder to ensure the relationship with him was in the moral boundaries.I but in the span of 3 months had 50 calls in total with him each of 30 to 45 minutes and it were mostly from his side For the 2 months in the calls he used to call from his side so much that even though they used to waste my time so much but still out of courtesy for him I used to pick his calls because I knew he wanted to learn English and I thought i could do this much for someone who used to read all my long paragraphs where I used to share about my trauma , bullying,no friends .He used to offer genuine great advices so I felt it were just like diary entry but with genuine advices in return .I felt after 2 months of being on calls that maybe I was developing feelings for him and I knew it were wrong so I asked him again if in the future talking much will develop problems and he said there was no possibility and guys and girls could be friends normally .I felt if this guy had pure intentions so maybe I was thinking too much and the development of feelings were not even sure from my end like maybe they were or maybe not but those thoughts lasted for 1month only and then subsided completely and used to make me really anxious , therefore I wanted him to stop talking during those times but he used to call me so much from his side that I felt that maybe I was the one who was becoming wrong in the situation by not being able to control my feelings as he had ensured it was a pure platonic friendship. so I just shut my brain and focused on my life and used to just pick up his calls .We had a small argument during a call about my university people and I may have behaved little rudely with him and then he completed ghosted me and my friendship ended with him .But do you guys think I was morally wrong in this situation.My parents know about everything from the scratch and I shared every detail throughout and they say I am not wrong .But i need honest opinions of you people to know if I was wrong in this by having so much of talks with this guy even though for the span of 7months I used to refer to him as my brother and best friend to make him clear about my intentions.I knew he was taken from the first day and I think from his side his main aim was to learn the language but because for 7 months i shared about my life , bullying,trauma, humiliation and depression,ocd with the platonic topics of culture, country wars I got emotionally attached with him considering he was the only friend for me .The 4 months (chatting on silly topics country religion topics not personal ) ,3months (calling phase but out of which 2months were out of just courtesy as I wanted him to learn the language and had no anxious thoughts or feelings and 1month was when I talked more normal life stuff and that was the time when I felt anxious of having feelings and stuff not sure if really they were or not ) What do you guys think be ruthlessly honest with me .He used to also tell me that after his gf I was his closest friend to sometimes make me understand that it was not a pure transacational friendship from his end as I used to ask him sometimes if he was only my friend for learning the language.is it cheating from my side??? Am I moral??