Okay! Well to start off with friends are always way more important than guys so... in that case i think that you should tell your friend that told you to either tell her or you will because you want to keep your friends and guys are more forgiving then friends are. (not to say that guys mean more, They dont) Well I mean i friend has your trust and trusts you with everythig! Guys will usually let you earn their trust eaisier! (don't take adventage of that) but.... I would just talk to your friend that told you and maybe your friend and you can both just tell her. Make sure she dosn't tell her boyfriend that you guys told her tho! Have her ask him that she feels like he is acting different then usual and that she wants to talk to him! Good luck! If you need more advice im right here! Megg