"She lied and lied on top of the lies to keep it hidden."

This is typical. It's nothing new.

"Plus their relationship was sexual. How the heck can I get past that?"

That's up to you. It's not impossible.

So if you're saying that you're done especially because she had sex with another guy, why haven't you filed yet?

M-43 W-40
2D - 9 and 5

Emotion, yet peace.
Ignorance, yet knowledge.
Passion, yet serenity.
Chaos, yet harmony.
Death, yet a new life.

RECONCILED AND WISER