I know that feeling. You are both looking for excitement, but he has a girlfriend, so he is off limits. He seems to be wanting more than what he already has and he might think you may be leading him to that excitement. If he is lying to get away from his girlfriend, then he isn't being honest. He shouldn't go on dates if he has a girlfriend. If he did want to be with his girlfriend, he would have broken up with her, but he still wants to be with her. This could lead to tense feelings and could ruin his relationship with his girlfriend. You should respect his relationship. If you have a hard time controlling your romantic feelings, then you shouldn't invite him I agree that there are other single men who would be honest and devote his time and there would be no guilty feelings, but this one is already taken, don't chase him