If your partner cheated.i saw this guy and we slept together and not long after I found out via facebook he had a gf.we had been chatting for about four months which is about the duration of their relationship from what I can I can see .im thinking about telling her I feel his behaviour is very unfair on everyone .i asked him to his face if he was seeing someone as I had spider senses somehow , he lied blatently. Im wondering what is the right thing to do in this situation .thanks for reading