Is it normal that my boyfriend is indifferent to breasts

OK, so i have been goin out with my boyfriend for a year and a half and we love each other very much. I have let him know that i am insecure about my boobs as they are not the biggest in the world..(which is fine I know :) ) I think i do go on about it a lot though and it pisses him off to see how upset i get over it, and it often turns into a fight. He isn't a "boob man" though , he always says, and doesnt honestly care about size, however he said he loves mine. Last night for some reason or other i was feeling all hormonal and insecure about my boobs and body and i asked him to say one nice thing or feature he likes/ is turned on by, about my boobs and he couldn't. He said he's indifferent to boobs and that asking him that question is like him asking me to say my favourite part of his ear! BUT he loves scarlett johansson, and i reckon that's pretty much all she is, boobs!I feel MORE insecure now, as he always said he liked them and now he says they don't do anything for him and boobs in general don't really turn him on! So, I'm wondering, is it normal for a guy to be indifferent to boobs or WHAT IS UP!!!!