>Ultimately, I guess I can't change what he does or doesn't like, I can only hope he'll like me the way I am, the same way I like him.

You nailed it. No need to wreck yourself and your chances with him because of this. Be natural. Study yourself, and wear what looks good on you, not what tries to make you look like something else.
It's not like he did not have ample opportunity to appraise your chest. Since he's still interested, why on earth would you try to make your chest look bigger? Just make it look pretty, that's plenty.