there'll be no music when we kiss
Male - 26 Years Old
I agree with White, there's no way I'd put a friend (or anyone) in this situtation. If you were living alone sure, no problem, but asking to stay with you AND with your girlfriend is really fucked, especially when he has other options. He's being really selfish.
Still, if I was in your shoes I'd tell him, as the user above me said, something like "you have until the end of February to get a job, and if it doesn't work out you'll go to your other friend's house".
If he doesn't want to leave your house once he's settled, though, it's gonna be a shitty situation. But at least if that happens you'll know he's the one being an asshole, and not you.