I really liked someone and my mate didnt tell me she liked him too, they got together and then I found out, I was gutted she hadnt said but years down line she's not with him after he got on drugs and beat her so I had a lucky escape. So if I were you just carry on as you were, he hasnt got a tag on him saying he belongs to your mate, she is perfectly happy liking him and not being worrie about you, at end of day really its the blokes choice who he gets with, it will all happen the way it does for a reason. x