My friend cheats on his girlfriend with prostitutes and I'm seriously considering sending an anonymous text to her.

This has been going on for about four years and I found out about it a year and a half ago.

He's been with about fifteen prostitutes. He told me this himself and has spoken about going to Amsterdam on a holiday and hiring hookers.

I lived with this guy too, and one day he told me he was going to the shop. When he came back he revealed he actually went to get a handjob at a massage parlour. No massage, just a handjob.

He's been with his girlfriend since they were in school, so they're dating about seven years. She loves him so much. They're renting a house together now and are outwardly the perfect couple. But I feel like it'll come out at some point in their relationship and I think it would destroy her forever.

I think it's fucked up and disgusting. I want to send an anonymous message to her and just let her know what's happening but I don't know how many people he's told. I think he'll know it was me. I don't know what to do.