Breakup .

My boyfriend (well now ex boyfriend) and I have broken up. He was so insecure about everything. He got cheated on by his ex over 3 years ago back in high school. So now he questions everything I do . He even slightly accused my college roommate of trying to “steal” me from him . I told him that wasn’t true and he started asking me questions like if I change in front of her and If I would date her and what not . I’ve tried to give him the reassurance he needed over and over again but things like his has been going on for months . Anyone who tries to be my friend (including people that I’ve been friends with before I even started dating him) he gets insecure about and assumes that they are trying to date me or steal me from him. He even admitted that everything was in his mind and it was him. I know it was definitely for the best but I guess it still hurts a lot because of the memories.