I'm assuming that you both lived together. If you had a rocky relationship or it was an abusive relationship then he's mean to the bone and he's getting even with you by not giving your personal contents back. If this is the case then ask for police assistance or take along your father, brother to get your personal belongings back. Whatever YOU came into the relationship with such as clothing, dishes, utensils, furnishings, etc., and any gifts he has given you are YOURS!
BECAUSE I GUESS HE THINKS IT WAS A GIFT FROM YOU
Baecause he wants memories left from you or he wants to annoy you
tell them how you feel then give them want they want
Give him a reason and tell him why you did that..
HE wants you to go find him and give them back to him.
get away from him ,and if he wants to come back say no .
If they weren't really that important and you haven't even been wanting them back then he may have just thrown them out. If it really doesn't matter then just leave things and don't worry about it - move forward and replace whatever things they were.
Give it up
The first thing you do is act like you agree with the breakup now. This will catch him by surprise and give you back some power. Then, stop calling and texting. Just disappear from his life. Give him a chance to miss you and wonder what you are up to suddenly.
Get a big dead gopher and give it to your boyfriend and say "Unlike this gopher, my love for you will never die."
ignore the person and make him or her think you are not interested in that stuff
Suck his balls
Give some back.
Give him the space he says he needs. If you pushed and came across as needy, he may not want to have a relationship.