She broke your heart and your trust, destroyed your security. Your head may have forgiven her your heart and soul clearly haven't.
Obviously your more traumatized than you realized. I advise you both getting into therapy quickly before the problem becomes compounded.
Whilst your happy to be back, you don't just magically stop being hurt or angry for what she did. It's hiding and denying these emotions that are most likely the cause of I problem.
Do not allow her to start making accusations as this will almost certainly cause you to have even more difficulties

By the way, has she said sorry? And meant it.
Sometimes it's the simplest things that can help.

All the best, I hope you to work it out.