wow, i wish i knew a logical way to answer that. however, i don't. all i can tell you is that i think it goes back to when women breast feed their babies, so it might be a natural instinct to be attracted to them. i think some other hubber on here wrote something about gravity being involved somehow, but im not sure.
Plus, you have to remember the corporate stereo types like Playboy, and television have a lot to do with it too. As those sources tend to program what to find attractive in the opposite sex at an early age.
im deeply sorry to hear that happened to you though.
however, i hope you don't think that all guys are like that as I know im not. speaking solely for myself, i usually tend to look at a girl's personality first before looks. because chances are if they're as shallow or as mean as girls i met in the past, then they're ugly to me. not because they're not blessed with physical beauty, it's just their personality makes them look that way to me. in fact, there was another hubber on here i found very attractive before i even knew what she looked like due her personality. i won't say her name, but you get the idea.
look, some guys are just idiots. there's a reason why they say women are the smarter sex, it's because they can be a lot more logical and rational about things than us men. that's the truth.