Thoughts?

(M/22) met my ex(19/F) back in December and we started officially dating in February. I’m 22 years old and she is 19’years old. We knew each other for months and half and we started dating. We were all good and there were red flags about her. She 19 F” had all guys on snap, majority, I wasn’t even on top of the best friend list. That’s 1, she was making some controversial comments about going out to clubs and etc which I also let it slide. We went on a little weekend getaway which I paid for. She didn’t even spend a penny in the entirety of the relationship. I didn’t ask either because I’m not like that. But I let that slide too. Then it started getting little toxic, she was in university and I noticed her following increased and I questioned her, why she followed that dude” she said he’s a friend and shit. I started making it a big deal and started insinuating random things. Maybe I was wrong for taking it further from just following a guy. But she literally said “I’ll literally go and cheat on you and send you a video”. She said it in a tone like she already done it and has videos. I ended things with her because that was my last strand. Like I had enough. But it was still back and forth. I could feel the manipulation and idk I should’ve gone deep. I started getting anxiety attacks after the argument like shit was traumatic or idk. I was in hospital and I wanted to see her so my friend picked her up for me and she stayed in my house for 2 days. Like I should’ve just left her and never looked back. My friends and family knew about her and we officially ended after I got discharged. What do you guys think about this? I’m just trauma dumping and want advice for the foreseeable future.