The ex...

So I’ve been dating my boyfriend for over a year now and I have recently found his ex girlfriend’s jewellery in his bedroom and a pair of joggers. I know he has no time to meet up with her or anything like that but I’m worried that he still has feelings for her. I brought up the fact he has it and he said it was expensive so he doesn’t want to throw it away. He won’t give the jewellery to his little sister or anyone. He just won’t get rid of it and keeps hiding it from me ?

Is this something I should be worried about ??