>>13844They only think you're hot because "you" have a girlfriend.
Women want men who are already taken, it assures them that he is worthy of having a girlfriend, and he is a socially acceptable boyfriend which will either improve, or at least not hurt, their social status. Also jealously of wanting what other females have, or to deprive other females of having something, even if they don't actually want whatever it is (in this case a guy).