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If you allowed him to move in with you, then legally you are his landlord and he is your tenant. So you would have to give him a written 15 day notice to terminate his tenancy and then evict him through the courts if he won't move.
After the 15 days have run, you can go to court to file a complaint for eviction. The clerk will then issue a summons and the tenant (your spouse) has 5 days to respond. If tenant doesn’t respond, the landlord (i.e. you) can get a default judgment. If tenants respond, a hearing is scheduled for some later date. After the hearing or default judgment, if the landlord wins, s/he can get a writ of possession which would allow them to have the sheriff put the tenant out 24 hours later.
You can't really just throw him out and lock the door as that is an illegal eviction and he can call the police and they will force you to restore him to possession and tell you that you have to go through the court..
As an aside, in addition to being an attorney, I have also been a landlord for over 26 years...
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