Found another girls jewellery in my boyfriends room. What should I do?

Me and my boyfriend are going out nearly 4 months now.. We get along great and I'm crazy about him. But today while I was getting ready In his house I noticed another girls bracelet in his drawer where he keeps some of my stuff.. (Reason why I seen it there) He did tell me that he was seeing someone before he met me but never told me who it was so I'm guessing it belongs to her as I really can't see him bringin another girl up to his house as his whole family knows we're together and we spend a lot of time with each other at the weekends and during the week the odd times. But why would he be keeping this bracelet is he planning on giving it back to her? Should I confront him about it?
Found another girls jewellery in my boyfriends room. What should I do?
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