I (18 male) have a friend M (18 Male). M is very active person and people call him 'action boy’ and ‘fuck boy’. Last Summer I took M to a camp where he met my 4 female friends (he already knew two of them, and he used to date one of them). During the camp M had one-night stand with my friend E (18 female). Next night he had night stand with D (21 female). After the camp M and D began dating.

After some time, M met S (17 female) and S fell in love with M. D was quite unstable, so M was thinking about break up. After some time, M broke up with D, but he kept in touch with her even though they had broken up, so they had something like a situationship. At the same time M had some night stands (just making out) with S.

M did something questionable. He invited both D and S to his apartment at the same night (of course at different time so they don’t meet). So, M had nightstand with both D and S at the same night.

I am a friend of all people mentioned, but mostly M’s, so I knew what he does. I went to grab a beer with D and some other friends after this ball. I couldn’t resist the urge to tell her what I knew so I told her how M treats both. Even though M and D didn’t date at this time this information made D cry and made her feel betrayed as she had trust in him. S doesn’t know up to now. Me and M had quite rough time, but our friendship didn’t end.

M and D got back together during Christmas and after few months they broke up again. Overall, this time he is somehow in touch with S. After M broke up with D for the second time, he took S out and were holding hands and such. M explained S that he doesn’t want any relationship but still gives her some signs of gives her fake hope.

I asked him few times why he keeps having both around and doesn’t date neither of them, his answer was that he likes this way.

Me and S are taking dance classes together and once, it was already late, I walked her home. She asked me about M, I hate lying, but I also hate keeping things to myself, so I told S M’s backstory concerning dating and women (S still doesn’t know what I mentioned above). S still loved M at the moment. The worst thing is that it lasts already about half a year, the girl can’t get over due to that M still reappears in her life. During our walk with S mentioned no contact with M and I recommended it to her so they both (mostly S) can move over. I think that even though it may be painful option it is the best because you finally end these mixed feelings (M kept reopening the wound. It might hurt less over time, but only if you stop reopening it.). M thinks he did not do anything wrong that thinks it is a bad thing to stop talking.

Week after my talk with S, S asked M out to end it all. M is mad at me, but I don’t feel guilty or sorry for him. So, am I the asshole for telling my female friend who my male friend really is and recommending her to avoid contact until she is healed?