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Help!! My friend grows bacteria!! ;( How am i gna live with him???

So basically yh... we agreed that myself and my other mate are going to move in with this friend (we'll call him X) and made this plan 2 month ago. However, we were told by X's flat mate that he is the flatmate from HELL!! he leaves food in the kitchen for 3 weeks to the point where blue bacteria grows on it like wtf.. he doesnt wash his dishes and when he does, he merely wipes it and puts it away... furthermore, he takes up 95% of the freezer... and the rest of the 5 flat mates have to share the rest of the fridge... when they confront X about this, he says hes busy and gets confrontational. X's flatmate has said we can move in with him, but we dont wana snake X as hes a cool guy. I cant deal with bacterial colonies in our kitchen... and as for the toilet, lets not mention that. And dont get me started on X's flatmates protein powder. He only said he can borrow some of the powder. A normal person would borrow a scoop or two max, he decided to use the whole 40kilo bag in one day... (exaggeration but it was finished lol)... someone help us wat shall we do. even if he promises hes gna not do it i dont wana get tied down in a year long rental contract. Appreciate the help. thanks