Lan, It seems to me you are also keeping that cycle going!

- You threaten to call it quits if she contacts OM
- She threatens to be with the OM if you don't "woo" her.

So you "woo" her and when you are stressed to the limit "wooing" things begin to fall apart; she goes back to OM and the cycle starts again. Do you see how you are turning the crank?

Be a BAMF!

PS. I could be wrong but I thought I throw this out in case it helps.