My boyfriend........?

Most likely he wants everyone to know that you are his and your taken. He doesn't want to lose you so by being so intimate in public and with friends, its just a way of letting them know what your his. It's weird but guys tend to do that alot. Or idk if you've noticed but sometimes when your taking to a guy he doesnt know he'd prob go run over and kiss you or hug you. If you dont like it, let him know. Tell him that you love him and that he shouldnt worry about losing you, that would make him feel sooo much better!!