Have you got that STD test yet? I doubt he’s the first. You need to protect yourself! Run, don’t walk to your nearest doctor and get a barrage of tests for everything.
If the opportunity comes up, move back into the house and tell her to move out or throw her stuff on the kerb. She’s the one choosing to break this family, she should move out - not you.
Are there kids involved?
100% don’t contact him or her. It would be counter intuitive to DB principles and common sense.
