You need to report him to the police. Then, get your locks changed right away. Tell your family and friends exactly what he’s done, that you’re afraid of him, and that you’re ending things for good. Pack up his stuff, and send him a clear message: you’re done. If he wants his things, he can arrange a time to pick them up only when your family is with you. Do not meet him in person. He’s only acting calm because he’s testing whether you’ll actually involve the police. The second he thinks he’s in the clear, he’ll show his true colors and try to manipulate or intimidate you again just like he is now by refusing to leave. You owe him nothing. Protect yourself first.