My boyfriend doesn't believe me when I tell him he's handsome?

I've been dating my boyfriend for about 5 months and I love him a lot. He's very supportive and knows how to cheer me up when I'm down. Every day he makes sure to tell me at least once he thinks I'm beautiful or pretty (even when I'm a gross mess). And in return I want him to know that I think he's handsome, but every single time he just blushes says NO and insists he's ugly. Sometimes we do have fun going back and forth with yes and no, but sometimes when he's seriously down he really believes he's ugly but he's not. I think he's a very good looking guy, but he has low self esteem since he was bullied a lot in school. (He was that tall dorky shy kid who is awkward around people). And I wish I could help him realize he is handsome. My friends all think he's cute and charming, but he just laughs and smiles and shakes his head no. I mean, it's not ruining our relationship but I'm curious if there's any way to help him see what I see in him? Like, I can admit I'm pretty when he tells me and I say thanks or when I'm a mess I argue he's crazy. But every single time I say he's handsome he says I'm a liar and just laughs or shakes his head no. Is their a reason he does this? What's the best way to help someone with low self esteem? Will he eventually grow out of the self doubt?
My boyfriend doesn't believe me when I tell him he's handsome?
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