I don't think you're a whore, but I also don't think you're being fair to his girlfriend or to yourself.
You deserve a man who is available. I've never seen a relationship that stopped at "just kissing and flirting." It will develop into more
. I know it, you know it and he's counting on it
. If you aren't into him, why kiss him?
I would, of course, think about how his girlfriend is feeling right now. She most likely suspects and probably isn't sleeping well at night and is wondering when the ball will drop.
You said "he wants a roof over his head" Is he the kind of guy who will live with a girl, when HE doesn't have a job or pay rent, just to get out of responsibility? Honestly, he doesn't deserve you or the woman he is living with.
The thing is: If he does it with
you, he'll do it to
you. Meaning, if he's willing to do this with you, if you and he end up together (assuming he can get his lazy ass a job and pay some rent) what would stop him from cheating on you? It obviously doesn't bother him to kiss an other woman, even though he has a commitment and is living with (off) some other woman.
DO NOT let this guy move in with you, unless he has a full time job and is willing to pay half of the rent, utilities and food. He sounds like the kind of guy who lives off of women. Those kind of guys don't rate highly in my book. I would never date them, much less kiss them.
You deserve better than a mooch and a cheater. Don't you?