<human>: My boyfriend and I have been together for about a year now. We already had "the talk" about our past relationships. He admitted to me that when we first started dating, he was trying to get back with his ex, but it didn't work out since she was seeing someone else already. I wasn't worried/upset about it at the time because it happened over a year ago and I figured he wouldn't be with me if he still wanted to be with her.

Now last weekend I was staying with my SO and wanted to surprise him in the bedroom. So while he was showering, I got myself all dressed up (or down?) and went to grab a condom. He usually keeps the box under his bed, but all I saw was an old shoebox. I figured he had the condoms in there, so I went to pull one out and ended up finding something else entirely. He had an entire box full of old pictures and letters from his ex. I obviously freaked out a little bit and put the box back where I found it. I've been trying to pretend like nothing happened and I keep telling/convincing myself that it doesn't mean anything. But now that I've absorbed this info, I'm starting to second guess my reaction.

Is it normal to keep mementos of your ex once you're in a new serious relationship? What/how much is acceptable? Does this mean he still wants to get back with his ex? Please help me sort out what is going on so that I can figure out the best way to handle this situation. I don't want to overreact and cause more harm than I have to here.

Can you condense the text into three sentences or less?
<bot>: My boyfriend keeps a box of pictures/mementos of his ex under his bed. Does this mean he still has feelings for her??