[Sundae]

Fresh you're not going to want to hear this, but...

Deep breath.

It is not up to you to dictate who falls for whom.
You are NOT with your ex any more. Having a new boyfriend does not make her a slut. If she was lying down with every man who walked past and had cum dripping down her legs onto the sidewalk you might be justified in using that word, but she is not and you are not.

I doubt they were intending to lie to you when they denied anything happening - they were probably denying it to themselves at the time. And after all, your reaction is no doubt one of the reasons they continued to deny it.

I know your feelings have been hurt. But this is not about you.
I am truly sorry they have been hurt though, and as a situation it does suck. Still, you'll never feel worse about it than you do now - things can only get better.

Oh and the drama does decrease as you get older. Partly because you stop seeing every situation only from the inside. Many of the dramas of youth are self-inflicted and you just don't have the energy as you get older!