James Potter: He started to show a lot of interest with Lily Potter and you got really pissed at him when you saw them holding hands.
Remus Lupin: He acted like you knew nothing about being a werewolf and "banned" you from helping him with others at full moon when you were the one who did lots of research on how to calm down a werewolf
Sirius Black: He started to flirt around with other girls and drift away from you or not listen to you when you were talking
Severus Snape: He accused you of not liking him and only being with him because he was really good at potions.
Tom Riddle: He was getting way to cold towards you even after all the things you did to help him with his plan.