Am I in the wrong for getting upset that my bf texted one of his girl friend?

Me, 22 f and my bf 21 m (this is both of ours first relationship) have been together for over a year now and in conclusion I have not met any of his friends because he decided that he wanted to cut off all his friends after we ended up in a relationship mind you I never told him to do that and before we even got into relationship I disclosed how important my friends were to me and I have one too close guy friends and eat before we even got together I told him if he wasn’t OK with that then we wouldn’t be a match. We had some problems in the beginning but after a while, he got to know my friends and figured out there were no bad intentions and everything was fine Until now yesterday my boyfriend was driving was driving me home and he told me to go on Spotify and choose a song I entered Spotify and I saw that he had DM a girl on Spotify. I get fully quiet. I didn’t know what to think and I was very upset and trying to process he noticed I’m upset he asked me what’s up and I’m still processing so I don’t really wanna say anything after while he says oh you found something on my phone that you don’t like to look at him a bit and then he says oh it’s a Spotify and then he says it’s just my old friend that is a girl mind you I don’t know any of his friends and in the past, I have told him that he should have a support system more than me and that he should try to get contact with his old friends but this was so weird. He texted this girl two times one in October and one in November. The girl did not reply back ninth of November. We had a big fight like almost a break up fight and he decided to text her during our break up to like in his words vent the message is pretty innocent. I guess it’s just in October what’s up name and then in November? It’s it’s me and of course I took it the wrong way because I don’t know how other way you would take it but I had to go to work so during my work shift I was processing the whole situation. I talked to some of my friends to see if I was overreacting or if I was valid my friend it was pretty weird because if this is a close friend to you for a while you should have their number or social media, not their Spotify I go home and I decide to talk to my boyfriend. He tells me that it’s just a big misunderstanding that I’m overreacting that it’s not weird and then he starts attacking me and saying that I shouldn’t even be mad and I was also in the wrong because I took a ride from my male coworker because I missed my bus and that I should apologise to him and I told him that he was pointing fingers and trying to avoid the responsibility and that he knows that it’s weird and when I told him that if I did this to him, he would be really mad and upset at me too, and then he got more upset and accuse me of trying to hurt him that I found really stupid then he started calling me childish and that he did nothing wrong and he just texted a friend and I didn’t believe that it was just a friend later on. He finds this girls Instagram and send her messages confirming that she is a friend and making me seem like I’m just a jealous girlfriend mind you in this message. She doesn’t really remember who he is immediately and they haven’t had contact in years so before we even got together so that may be more upset because the first thing you do after we have a fight is to fight a so-called friend that you haven’t talked to years to vent about me the first thing you’re gonna tell one of your friends that you haven’t talked to years is how bad of a girl I am mind you the fight we had was that he accidentally called one of my friends cute thinking it was me because of one picture. I just got really upset and I was just so done and I ignored all his calls and you started texting him because I got really angry and I was being really mean if I’m being honest I was not calm. I was very rude and I was really mad so the only way I could communicate with him was true text now he is apologising and saying that he felt really bad about it but I don’t think he does. I think he wants to be okay and I feel like weird stuff. Are you gonna repeat themselves? I want him to have friends. I want him to have a support system, but I don’t feel like it’s OK for him to text a friend that hasn’t been his life for years and the first thing he wants to do is rent about me so am I the asshole?