Why won't my boyfriend accept a break up and move out?

He has cheated... he hasn't worked the whole 4 years we been together. i resent him and can't stand the thought of him and he acts like daily everything is fine, gets mad I won't have sex with him and everyday is a fight!!! He won't leave and I had this house before him.. why won't he go back to his mom's?
Why won't my boyfriend accept a break up and move out?
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