@KrazyQuik,
Your ex can sleep with whoever they want to.
So can you.
That's what being an ex is all about; not owing any allegiance to the person from the earlier relationship.
She told you something that you didn't want to hear. Okay, so at what time was it impossible for you to say, "Becky {or whatever her name is}, this is TMI and I don't want to hear it."
If you are hanging around in a friendship but really just want to be in a relationship again, that's not friendship -- that's you keeping your foot in the door in the hopes that you can prevent it from being slammed shut.
It also keeps you from moving on.
So …
1) Stop hanging out. It's not doing you any good and is only serving as avoidance behavior for you, and preventing you from developing other relationships.
2) **** or get off the pot. You're either going to get back together, or not. My crystal ball is often cloudy but it says that the chances of you reconciling are very low. So ask her where you stand and
be prepared for a letdown.
3) Go out and meet other people. Not at bars. Go to Meetup and join groups that do things that you like. Do this not to find dates but to find actual friends.
4) Seriously consider counseling if for nothing beyond learning how to better set your expectations.