So theirs this guy I've liked forever. I recently found out that he liked me too. When me and him started talking everything was going good until this girl ( let's call her S ) came along and started liking him too. He took his pick between me and her and decided that I was "the one". Just last week I was hanging out with some friends and I seen a snapchat story with him and S. She was on his lap. I didn't mention anything to him about it and now he's asking for "pictures" from me or he's going to go to her. What should I do?