Boyfriend and his Ex

My boyfriend and i have been together now for nearly 9 months, and near the start of our relationship i found a sort of scrapbook that his ex had given him in one of his drawers. It had pictures and she talked about how much she loved him blah blah blah. I never told him i had seen it until we had an argument one night, where he told me he had forgotten it was even there. He assured me he'd throw it away as it meant nothing to him so i left it at that. When he was moving out of his mums it surfaced again but he left it there and didn't bring it with him to his new place. His mum came to the flat with a bag of things he left on moving day and the scrapbook, of course, was there. He told me he'd get rid of it (again) but recently i found it in a box under the bed. Would any of you be worried by this? Should i confront him? :( I guess im just worried that he misses her or still has feelings for her. He's told me she means nothing to him anymore and that our relationship is far better than the one he had with her. But i can't help wonder... Would be grateful to know what people's opinions are!

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