Long story short, i broke up with my ex of 14 months about a week ago. Since then he reached out, crying and stuff. We talked a lot after that basically i was unhappy in the relationship and we had multiple points that we were gonna except from each other if we get back together. One of his points was that i dont go to parties with my best friend since he thinks she's bad influence. Well yesterday i went to a party with a friend group but me and my best friend went to pee, and my ex saw us multiple times. I wanted to text him but i saw i was blocked and when i confronted him he said its because of my best friend and me, and that hes not gonna be a clown. I said if he wants to throw us away because of this then congratulations and went away (drunkenly). I feel slightly responsible but first of all we weren't back together yet, second of all i was truly with my friend group but he didnt believe me. So AITAH?