from experience tell him unless you dont want to be his friend anymore.
Cheating
you should apoligize t your friend and his girlfriend
you tell him and ask if your really best friends, because best friends should never ignore you
If u want to be slapped
Best friends are best friends because they share similarities. Lazy or hopeless guys love their best friends' girlfriend because he would like the same kind of girl.
As friendly as those kisses could be, I think your girlfriend might get pretty mad at you. Remeber, stay faithful to your girlfriend. yes that is really bad because would you give you guy friends friendly kisses on the ceek. JESUS LOVES YOU UHHHHH let me think......................................YESSSSSSSSSSSSSSSSSS!!!!!!!!!!!!!!!!!!!!! that is terrribale why would you even ask that, YYYEEEESSSSSSS IT IS BAD!!!!!!!!!!!!!!!!
Of course it does! And then you have to decide between your girlfriend or your girlfriend's best friend to be your lover.
Try to get to know her. Maybe you two will get to like each other. If not, then just be honest and tell him. its HIS girlfriend not yours.
Tell him that she is trying to control him and when she's gone he will not have anybody.
Yes you should tell her that he is cheating. Because later, it will hurt her if not told.
they were the best of friends. kisses all round.
If you want your friend to still be your friend, hang out with him. You might find out what he likes in his girlfriend and she could be your friend too. Friends do this for each other.