My advice is to forgive him for God's sake, everyone deserves forgiveness no matter what the offense might be,
Now as letting him in, dats ur decision to make, because he might plot evil to bring u down, so be careful and also prayerful.

If it were to be me, I don't think he can spend the night in my house, that doesn't mean I not forgiven him, it doesn't mean am holding grudges against him, No.
What it means is that am trying to avoid troubles and being a victim or even a prey, because evil thoughts will be eluding his mind even to eliminate the person, because he never wanted you to be better than him. And u can't change that mindset.

It's 5 : 1 now 65mins