>>1 he lied to you. That's a bad sign, he's obviously skillful at talking and make sure that no matter what he says you don't feel bad for him!
There's another girl and it seems as though he wants to cheat, so no matter what do not let him do anything to you!
There is a minuscule chance that he isn't a lying jerk, maybe he just wants to know that he'll still have someone if he chooses to dump his girlfriend. He seems nice of the surface but can never really know what a person is like on the inside. Do you really want to risk having your heart broken? Do you want to risk him using you?
Like
>>2 said, he's going to try and make you feel guilty and that's absolutely NOT how to ask a girl out!