He has a girlfriend but says he likes me?

I met this guy at work he has a girlfriend of 3 months...me and him talk a lot I go over to his house after she leaves like every night I've stayed the night over there a few times and he's stayed here at my place. he has told me that he likes me and that we could have a chance but he won't break up with his girlfriend. Does that mean that he wants me to wait for him or should I just give up I really like him a lot.
He has a girlfriend but says he likes me?
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