I'll keep it short:
- My brother dated his his girlfriend for 4 years
- I found out she's cheating on him with 2 guys
- She said if I tell him, she'll tell (she has evidence of it) what happened 2 years ago
- 2 years ago, we had a ONS and promised to never speak of it, never did it again
I really want to get it over with. She's a cheating skank and now I hate her. Yet, I did him wrong too. He's going to break up with her for sure but then our relationship will suffer too. So what should I do?