<human>: My ex and I dated for just over 2 years. It's been about 2 years now since we broke up for good. For about a year or so, we hung out often as friends. Even though she had a new boyfriend, I stayed single (by choice). Then, for no clear reason, we stopped hanging out as much. It seemed mutual at first, but now she won't answer my texts, and when we do see each other, she treats me like a stranger. The worst part is, we both have the same overarcing social circle. She'll hang out with my roommate and best friend, usually during the same period that she's not texting me, or giving me the silent treatment, or whatever it is she's doing, and then I'll hear about it afterwards from them. It's been messing with my head.

Now I just found out she and I are both DJing at the same party. It's making me mentally exhausted, thinking about how to deal with her at this thing. On one hand, I don't want to be friends with her anymore. On the other, I want to present myself as congenial and not bitter that she's an awful person towards me (this is for both our sakes and everyone who's going to be at the party). Any advice on how to come out of this thing with my dignity intact?

Can you provide a brief overview of the text?
<bot>: Used to be friends with my ex. Now she doesn't answer my texts and treats me like a stranger. She and I have the same friends. We're going to be at the same party this weekend. Halp?