How to act when an ex invites you to party?

So if someone that I used to date and haven't really been on speaking terms with for a while invited me and my friends to meet up with him and party this weekend after the football game, how do I act? I haven't really forgiven him yet and he sort of owes me an apology, but I still want to gradually let him back in and give him another chance. However, I know that an apology or serious conversation isn't going to happen in that environment. I know I should probably just wait til we can talk, but I don't wanna risk losing my opportunity. The problem is, I don't want him to think that just because I showed up and he was nice and bought me a few drinks that everything is fine. I was thinking about just not talking much and being kind of stand offish to show him that I'm still angry but I don't want to end up turning him of by being a buzz kill. I also thought about just focusing on my friends and paying him no attention, but that makes me feel like I'm just avoiding the situation. How should I act to let him know that I'm still angry but that he has a shot if he's willing to work for it without actually saying it? I don't wanna be a complete bitch and make him wonder why he invited me to begin with, but I want him to see that he is going to have to work to fix things with me. Any advice?
How to act when an ex invites you to party?
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