Dusk at Dawn.

[newmama]

I have never ever believed it was okay to stay friends with ex boyfriends or husbands! It is too dangerous. They could be led on and hurt, you could be led on and hurt, your new boyfriend/wife could get hurt...so contrary to my current actions, I just cut the ties and go.

BUT if you don't want to be done with your ex, a friendship is good AS LONG as you don't have a boyfriend/girlfriend and neither do they!

doesn't this make sense?

so maybe don't be friends with her while she is with OM? And tell her?