Yesterday’s fat.
Girl, don’t spit on your weight. I have a company of four friends. Body structure, hair color, growth are different for everyone. No one has an obvious excess weight. One of them is very, very thin. But! One of us is beautiful. Of those that without exception are very beautiful and attract everyone’s attention. Attention is not always pleasant. And very often, as you described - there is some unpleasant individual who does not understand any words of rejection. And one day we all in the four could not drive out such a “beautiful man” because of our table. "Work is there, I go to the hall, I am confident". That he may be someone not interesting in his head does not fit.
Your girlfriend attracts your attention. You have nothing to do. Do not reinforce your complexes, many girls and women face such unpleasant situations, regardless of weight. Do not take other people’s behavior on your own account.