Something isn't quite right. Whether its a boundary issue or something else, the situation is not proper for someone who is in a relationship. Try communicating with him, discuss your feelings and let him know that that kind of behavior is disrespectful to you. He will make his choice. Either he will set boundaries with this friend, or he won't. If he doesn't, do not be afraid to move on. It could be a blessing in disguise, either way....

~Seanachai~