Sorry if this seems shallow but what do I do?

I like this guy, we have been on a few dates but he is overweight so I do not feel sexually attracted to him. I’ve seen pictures of him when he was not overweight and I believe I would have been sexually attracted to him if he still was that weight. I really like his personality and we talk like we have known each other forever. I am just worried about sexual attraction. He has mentioned he wants to lose weight but I don’t know if I should bring it up again? Or how I can tell him the truth lightly..
Sorry if this seems shallow but what do I do?
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