This sort of thing has probably been done to death, but this is the first time I've been in this situation. I was seeing someone for a couple of months, very full on, said he loved me. He broke it off a couple of weeks ago but stayed friends, still being very flirty via text. I just found out he has a girlfriend and they were definitely together for the duration of our relationship. Would you do anything? I have told him I know, but can't see him coming clean himself.