[southwest]

I have a huge dillema. I'm going to use names so that i don't sound so confusing. My boyfriend's name is Christian and his older brother''s name is Matthew. Matthew's girlfriend is named Diana. Well, here goes. Matthew is cheating on Diana. I only know this because Christian has told me. Diana is also now my roomate and doesn't know that Matthew is cheating on her. The four of us are really close and now Christian doesn't want me to tell Diana about Matthew cheating b/c it will rat him out. He also told me that Matthew doesn't plan on telling Diana b/c he's planning on breaking up with her. Well, a few days ago, he only told Diana that he wanted a break for a week and now that he wants to go back to just "dating." Diana thinks that everything is just fine and is always so happy to hear from him.

This is driving me crazy. I want to just scream at Matthew for what he's doing. I also don't want to be the cause of a fight between my boyfriend and his brother, but I feel that Diana has a right to know. My boyfriend hates lying to Diana too, but he's more loyal to his brother. What in the world shoudl I do? Please help me, I'm losing my mind over this and it's starting to cause fights between my boyfriend and I.