I dont feel it is right that you should have this information and not let her know..
I can imaging the things they say and do together when they have their alone time...The emotions she will share with him not knowing what he is doing...
Be a good friend and cover her back...
She may break up with him but dont let her be at the loss of you too
RE: would you change
Yeah..bigtime...If i didnt marry her i could have been doing someone else