So my bf's best friend lets call him Dan, has a gf let's call her Sara, and they are in a long distance relationship. About 2 years ago, Sara has been playing around. She didn't cheat but she was doing things that Dan was not feeling too happy about (Like going out with a bunch of messed up guys, talking to too many guys "as friends", lying about where she was going/hanging out with.. Etc.) When Dan knew about all of that they kept going on and off for almost a year. This year she proved to him that she was sorry and she wouldn't do it again. So he started to forgive her. But things were still very very rocky.
About 6 months ago, she started talking to this guy lets call him Sam (who lives abroad), who claims to be her friend, he finally confessed his feelings towards her and every since then they have been talking everyday, she tells me about everything, I never gave it too much attention since I know she really loves Dan.
To Dan's and my realization, she went to the state where Sam lives in (Dan does not know about him), and lied to her bf about where she was, her bf somehow knew she was in that state from the area code and then she finally confessed.
Of course I was caught in the middle of it.
Both of them called me complaining about each other, I was listening to both of them but I did not take sides. Today Dan told my bf (he doesn't know much about their problems) about everything, and now my bf is asking me to tell him what I know.
I told him that I didn't even know that she travelled there (which was the truth), but I didn't say anything more.
I know the right thing is to say the truth, but at the same time I feel that I was forced into this, I never wanted to be part of it.. I don't know, I'm just really hating myself right now. 
