My ex won't return my stuff?

Hi, My ex and I broke up about month and a half ago, it was basically a mutual decision, we had a very intense relationship, we were great together and we loved each other. He is very young (19) and he is in the stage were he just wants to party with his friends and drink, even though he loved me, I didn't tolerated that so I broke up with him one night that I found out he lied to me about being with friend "sleeping" and, he was in a party with his friends. (he was very loyal, no girls involved) I got mad and broke up with him, he agreed, he told me he needed time with his friends, that everything we had was real, but he wasn't ready to give me what I deserved etc... anyway we broke up in good terms.

It has been the most difficult breakup in my life, because we cared about each other but the timing wasn't right. After we broke up it was very hard to disattach so we had each other on snapchat, We posted snapchat stories all the time about stuff we used to do together, I posted selfies, he posted with his new dog, and we were very aware of what the other was doing. One day I posted a snapchat story in a party, I think he got upset and he deleted me.

Now the problem is, I have a lot of stuff in his house, my favorite bathing suit, my favorite pijama, a watch that I love and a a black blouse I used a lot. I texted him 2 weeks after we broke up asking him that if I could go to pick up my stuff, he told me very politely that he could bring my things to my house. One week after he apologized for not leaving the stuff that he was very "busy". Two weeks has passed and nothing, I wrote him that I could go if he was very busy and he hasn't responded. Is he mad? I really want my stuff!! What is going on with this guy?
My ex won't return my stuff?
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