i have a C cup breast, and my ex boyfriend who look at other women in a way that made me feel uncomfortable. so it isnt what you have or don't have i think it has to do with respect. i believe there's nothing wrong with a slight glance at a beautiful women (dr.phils wife even said this) but if he stares for a long time, which causes you to feel that way is wrong, and he should stop.
your husband is a breast man, but he's rude about it.
one thing i would suggest to you is buy a push up bra, it is sexy, & it makes your breast looks larger.
do you have any sexy lingerie where it shows off your shape, and breast.