What are the rules for keeping things your ex’s bought/gave you?

I’m in a new relationship. Kinda new I guess. We’ve been together like 5 months now.

He doesn’t know I have a pair of gold earrings, a couple rings, a necklace, a purse my mom uses, a hat my brother wears and a some sweaters and shirts my ex bought me while I was with him.

Is this stuff he needs to know?

Or should I get rid of some stuff??? Idek what I’d get rid of. I’m not throwing out good quality clothes and jewelry. But is it weird?

I was with my ex for 5 years. We broke up 2 years ago.