Separate situation?

Me and my ex husband separated for 3 years now. he get with a new girl right away who live in same city but I live in another country with 5years old daughter (his child) . He usual visit his daughter once a year but after first visit he have gone for almost 2 years to visit his daughter thats a sad things. We still haven't file the divorce which that his girlfriend not happy about...

Still everytimes he get back here visit us me and my ex had sex...
He said his girlfriend not really work on bed much and he is got high sex drive... should I tell his girlfriend about this? Im sound like a bitch eh.
Separate situation?
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