Was this casual or??

Hello ! i’m unsure if this is a good tag to put this under but i was hoping someone could relate at all to my situation

I, am a full circle girl kisser, around february of this year i met someone who was 2 years older than me and she’d said she was single and bisexual.

I’m rather confused on how everything played out as now i feel like i have emotional whiplash, we had gotten close, sexted a few times, talked about our family and our trauma. we talked almost every day for 2 months and she would flirt non stop, me fuelling that fire. last month she got sick, i didn’t think much of it because hey shit happens so we weren’t talking all that much. shed for 2 months let me stay up insanely late to talk to her , and said that she’d always be there in the morning if i fell asleep. multiple times also asking if i had eaten or not.

during that sickness one day she’s gotten drunk and texted me, saying i seemed like someone who always thought about my impact on others and i replied that it kept me up at night; her then going on to say how i was so good, so perfect and then said she was sorry if she ever made me feel insecure. i wouldn’t say insecure is the word that she made me feel but i digress, a few days later we were talking and she said she was embarrassed to text me drunk and i said it was rather cute she thought that of me and then she said it was oaky then

around 2 weeks ago, she texted me, the only thing said “hi i miss you” i responded and honestly, her saying she missed me etc made me feel really nice, like i actually mattered in a sense and that she thought of me. she went on to say in that conversation that she was talking to her ex again; she’d only dated 2 people before and she’s 21. understandable. i had said that maybe it wasn’t a good idea as exes are exes for a reason and she said but it’s fine and she’s so prettt and it’ll be different this time.

i shook my head and got considerably dryer. around 3 days ago she texted me, saying how she was out with her now girlfriend. that struck a nerve, because for 3 months, we had been inseparable, her telling me how perfect i was, saying i was always such a good listener for her etc. at one point even said she was so glad i stuck around with her through eveyrhting and i wasn’t fully truthful but i said that it was because i was attached; i had actually fallen head over heels. when she’d told me she got with this girl my respond was “oh” and then she asked me to add her on instagram because she wasn’t active on the app i had her on, unfortunately. tumblr.
which i seem to notice is an app where a bunch of situationships happen !

i just want clarity on if this was casual or not, if this was jsut friends, i don’t know.