he can no longer manage my nature , he might be leave me.

Hi Angel, I think you shouldn't leave him, if you love him why you don't change your behaviour for him as he promised you to be there with you for life, possesiveness is nothing but showing so much love, All the best.

If you are overly possessive and behave in a childish manner you need to make an honest effort to change. And make sure you do change. Write a list of the things he doesn't like about you (within reason) and then work to change them. It might help if he is able to see these changes. Or to become aware, somehow, that you have changed. I think you know what to do but need affirmation from others. Getting rid of your bad habits will be hard. If you're looking for an easy way out -- there isn't one. Or you could just let him walk out of your life. Sooner or later you'll get over it and maybe even find someone who will put up with whatever you're doing that your bf doesn't like. It's not easy to change one's bad habits. Good luck.