Last year had a fling with this guy. Only recently found out online that he is married with a kid. So he had cheated with me, and on his wife without both of our knowledge. I coincidentally swiped on him again on the dating app which I'm using as a single woman. So he is back to his cheating game seems. And this time he has put looking for 'a life partner' and a 'long term relationship'. I have his wife's insta ID. Matched with him again. This time would like to gather some evidence. Any ideas would be appreciated. Initial thought was to leave it but I have decided against this as this will only lead to him playing emotionally with other women and continually cheating on his wife without her even knowing. Side note- he performs and receives unprotected oral. Although I'm not in any trusting or committed relation right now, but if that happened to me without me even knowing then I'd be super pissed. Side note number 2, the first time he cheated with me, his wife was pregnant.