I have a moral problem?

so to Of my friends recently broke up.and I start backing my bro and he goes on how I'm Great (he is drunk)and how im always there for him when needs a left or hung over on a park bench blah blah. I go home and go on facebook and his ex is and she starts goin on how she need some to vent to(kinda my job in the group) so I tell her sure ill be there tomorrow and pass out next day I stop by and she start goin on about how he was never listeningor caringBlah blah blah and then she starts getting closer and well one thing lead to another ... now im back at my place going what the **** to do and typing this on yahoo help me figure out what to do right now