How would I tell him?

I like this guy I've been hanging out with lately. We have a great connection. Thing is, I can't get over how skinny he is in compared to me. I even pointed it out saying how my thighs are bigger than his, he laughed and said "so, who cares." He told me he's 140 pounds? I forgot 134-140 lbs. I'm 120 lbs. He's taller than me so that's not an issue.

He has a great smile, laugh, personality but his body.. I'm not vain or trying to be.

What can I tell him without hurting his ego/feelings? Or not too much.

I don't wanna lie to him. I hate liars, I don't want to be one of them besides I suck at lying.
How would I tell him?
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