If he moves in, the ONLY way to get his lazy arse out will be to endure a very long and troublesome eviction proceeding.
I say suggest an alternative.
Pay for him to live in a hotel for TWO weeks.
Pay the hotel/motel directly.
Let him register using his name, not yours.
Don't pay using a credit card in your name, let your stupid fiancé do that, or suggest paying the hotel in cash.
If he breaks or steals something, it'll be charged to the credit card on file.
If you sign anything, you're on the hook.
Have the broken down bum sign his own paperwork.
Or, gift him the cash equivalent and wash your hands of the mess.
But, don't let him move in, he'll never leave on his own.
He will run you away.
A home is not a hotel, a guest house, a hostel, or a flop house.
We don't permit any over night guests in our home.
We suggest hotels for some, and pay for hotels for others.
If you allow the camel's nose to sniff under your tent, sooner, rather than later; the camel will be in your tent.