Sorry to hear about the change in your sitch., but it seems like him remaining in the house has bothered you for some time.
The important thing about boundaries... we have to be firm and consistent. Otherwise we lose credibility and they go about doing things as they want. I know in my sitch., my W really felt the consequences of her actions for the first time when I changed the locks on the house. I don't think she gave much thought to what she might lose. Watch for the emotional tsunami, yours and his.
