My friendship was severely effected when I learned that my best friend since I was 2, slept with the father of my child. I ended up leaving him a few years after I learned that this had happened. Both of them denied it and continue to deny it. I know in my gut that it did happen for various reasons. But she is friends with my family and we have several mutual friends. We always run into each other at events and gatherings. Its awkward.What or how do I move past this without it being awkward?

This is a tough situation. Since she denies that this happened, but you're adamant that it did, one of you is going to have to accept that you're not going to get closure. That's usually what holds people back in cases like this. She says she didn't sleep with your ex, you say she did, one of you is lying or wrong. If she's telling the truth, why should she admit to something she didn't do, just to regain your friendship. If she's lying, you have to either accept that lie, never bring it up again, so you can regain a friendship.

Either way, someone has to let it go so you can move on.

Thank you... I agree. It is very tough because I don't want to be friends with her but I have family that is still friends with her and my close friends are her extended family. Im at a crossroads because I don't want to sever those relationships but I also can't be fake with her.