- Tell you about it
- Tell your partner to quit it but the friend wouldn't tell you about it
- Tell your partner that he/she should confess or else nothing
- Tell your partner that he/she should confess or else you will
Most Helpful Girl
I trust my friends enough that they shouldn't have to worry about me not believing them or anything. So I'd want them to either tell me, or tell my cheating bastard of a partner to tell me (or threaten to do so themselves).