Is it wrong to sleep with someone your friend has slept with?

I was friends with this guy for years and eventually introduced him to my female friend and they ended up sleeping together (it was her first time). They never dated or had any sort of relationship and after a short period of time decided they weren't going to sleep together anymore (they would usually just get drunk and do it..). My frien said she didn't feel bothered about not doing it again and she said she had no feelings for the guy. Then he starts telling me he likes me etc, and I wasn't that interested but we stared hanging out alone more and eventually slept together. Before this happened I had informed my female friend that he'd said he liked me, in a hint hint is it okay are you bothered way but we responses said nothing about how she "disapproved" in any way. After we slept together, which only happened once, we never told anyone but he would regularly try to get in my friends pants again in front of me, which I found really inappropriate because it made me feel like he was taking us both for a ride and getting everything he wanted. Eventually my friend found out and we are no longer friends and in her opinion it was wrong for me to sleep with someone she had slept with.. Despite them not being together and her saying she didn't care for him. So was I in the wrong or was it pretty obvious she was lying about having no feelings and really did but because she didn't object when I told her he liked me its backfired on her? Or am I a bad friend? (Another friend of ours also kissed the guy and she wasn't bothered about that and is still friends with her...)

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