Is it just me? what shall I do to get over myself?!?

It is human nature that men look at other women and especially if they are showing some skin. It is not him being rude to you. It is how men are wired in their brains. It does not mean that he finds them more attractive then you either. It is just part of their nature. Men are visual people where women are not visual. Men can find a woman who is thin attractive to look at as much as a full figure woman and it does not mean he will cheat on you. If you are in public and your man draws attention looking at a woman and don't take his eyes off her, that is rude, but if he glances at a woman who has large it doesn't mean anything, it's just nature.