There is this guy who I'm friends with, we spend a lot of time together and he shows signs that he likes me. Now just the other day I took his phone from him and I saw that he was talking to this girl and compaining that she doesn't give him enough attention. He saw that I saw the message and he... Show More
Most Helpful Girl
Because they can get away with it, the girls are taught to put up with it, and they are taught "boys will be boys" and get excused for their behavior. It's male privilege and "evolutionary psychology" (as a Psych major, that is NOT empirically supported, e.g. "men need to spread their seed").
However, that being said, this guy doesn't "owe" being faithful to you, as you are not officially together.