Why did he say that?

This boy I’ve been hooking up with and have only known for a couple days said to me the other day “I hope I become a memory for you.” And I asked him what he meant by that and he just said that he hopes he’s a memorable for me. We were just sitting at the train station in silence when he randomly said that. We both are aware that this is a no strings attached kind of relationship so I’m not sure why he would say something like that.
Why did he say that?
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