He said he's seeing someone new

[phoenix23]

One of the major reasons I want to go is to show him that I'm not just crumbled up in a sobbing heap, pining away for him every second of the day. I'm sure that's what he thinks of me right now, and I guess I can't really blame him, seeing as how the last time he heard from me I was all freaked out and bawling my eyes out over him and OW. But if I can go along to the football and keep my composure, smile, and stand my ground, then at least he'll see me in a different, slightly stronger light than he's imagined me in over the past several months. Whatever he does or doesn't do with that new image of me is up to him, but at least he won't be able to avoid seeing it.

I think this is a great reason to go. I get the impression that you and your H, like me and my H, have a lot of mutual friends that you will both still be in contact with, so the bottom line is that you will probably be running in the same circles for some time to come and you can't avoid every social situation forever, especially when it is something you have a legitimate interest in going to. I think you should go, smile a lot, be cheerful and upbeat, maybe even say a non-chalant 'hi" to your H if you see him (even if he is with OW), look your best and show him you're not defeated. (I say this as much for you as to convince myself to do this as well - see in my thread re: H's upcoming 30th b-day party).