You appear to be an adult so I assume he is too. This insecure thing really raises a red flag for me. Does he accuse you of cheating on him? Does he need to know your whereabouts at all times? Does he not believe what you tell him? Some people mistake this obsessive jealousy for love. I can't stress too strongly - it isn't! This is the kind of guy who becomes physically abusive, and good women like you get killed by them all the time. Dump him.