"she was getting too klingy."

This is good. But you're being too clingy by calling him up and half-begging for another chance, texting, etc..

You must stop this behavior so that you are the non-pressuring, confident, together one.

Do not tell your H anything about what you find out. Back off!!

M: 16 years
Bomb 4/07
OW 20s long gone
Divorced 11/09
I remarried New Guy
Cooperative r w/X regarding D