Why won’t my ex give me my stuff back if he's probably in a rebound relationship?

Misskris05
My ex still has a lot of my things and he knows I never got it back. Last month he told me he started dating someone unexpectedly and it was fast (more than likely a rebound). He told me we would talk about the exchange and that he would make sure I got everything back. I text him two days later after he told me about her asking when we could do it and he never responded. I even tried going through his sister - no luck. I haven't spoken with my ex in over a month and same with his sister. If he's in a new ‘relationship’ why can't I get my stuff back?
Why won’t my ex give me my stuff back if he's probably in a rebound relationship?
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