What would u do if u were me?

My boyfriend and I have been together for three months and I found out he cheated on me with this girl ive hated since middle school. He loves me. He said he was drunk and that he'll never do it again. When i found out i was depressed for like 2 weeks. i wouldn't answer my phone and stuff... then my boyfriend's best friend came to my house and made me feel better. this guy, max, has been my friend since elementary. he's like my brother but when we were talking and i was crying he told me that he cared for me and would always be there for me. i dont know if its brotherly love or if its more than that... he keeps sending me these signals and i want to like him but im so in love with my boyfriend, adam. Adam is the most amazing guy. he's so sweet and he's always buying me stuff. He says he loves me and i know he means it. Everytime he touches me i know that i can never be without him. But sometimes i wonder if i could stand being without him if i were with max...