Don't think this counts. But I knew both parties in a relationship.
Actually knew the guy first and longer. We had a fling... not sure what to call it... at maybe 18? So 10++ years of knowing him. A girl I met from work and became pretty cool with started dating him. Had known her 3-4 years. Well one day he hits me up on fb, to say hi. Literally . and she lost her shissh. Messaged me that she is not comfortable with us talking. Asked if he was trying to get at me.. I apologized and told her I meant no disrespect.
All thru the brief exchange(with him) I kept mentioning how cool she is and I was happy for them, and I hadn't spoken with him because it's a awkward situation and out of respect. And that I don't want any problems etc.
He's like oh she's cool , she doesn't care bc it was when we were kids... then he says he had thought about me a lot and even told her that he wished things would have worked out for us. I asked what would have worked out? It was literally a situation where we had sex ONE TIME and before and after just remained friends (as in talk on the phone, message etc. ) . I guess he made her think it was deeper than it was. Idk. I still dk. I still feel weird about it bc after I messaged her back apologizing and explaining the convo she never spoke to me again.
So I guess in that situation I came off like a "man stealer".