Why can't these guys stop staring at b**bs?

I know this guy from sometime. He lives in a same colony as I do. It 's been sometime I think I am falling for him. I had told my friends about this and they suggested me to make a move. So I talked to guy and asked him to be my friend. He accepted and we became friends. We have met quite a few times at a coffee shop near by my college. But I have been noticing one thing and it is really bothering me alot. The thing is that whenever I am talking to me, most of time I see that he is looking at my b**bs and that makes me feel really uncomfortable.