My son is 28, he has a good job and his own flat. We have a good relationship, except for the fact that he habitually cheats on every girlfriend he has ever had. His dad and I separated when he was 15, he has a good relationship with his father but his dad and I are no contact. My son has had a succession of 2-4 year long relationships, always with lovely girlfriends, not only stunning looking but polite, respectful, friendly and trusting girls.
He is due to go on holiday with his gf of 2 years on Saturday. This evening he has asked to stay at mine as he was seeing some mates locally. At 3am I'm woken by him coming upstairs and I go and find my living room and kitchen full of boys drinking. My son isn't there. So I find him in his room in bed with a girl having sex.
This isn't the first time I'm aware that he's cheated on this gf, but she's a lovely girl and I can't stand by and watch this happen.
So what do I do now? My instinct is to contact her via fb and ask her to call me and tell her, either on the phone or in person.