Thanks everyone,
I have just changed the lock on my door. It was really easy. I just went to the hardware store, bought the same kind of lock ($40), and replaced the bit that the key goes into. It makes me feel a lot better knowing that he can't just come in my house whenever he wants to.
So I will write him a letter (which he may or may not get, depending if he looks at his mail), leave a message on his phone (he doesn't check his messages either) and give him a deadline of the end of August. I think that's plenty of time. Then I will sell his stuff or give it away.
Fortunately, he doesn't have anything of mine that I want back (exept my sanity and I'm working on that!).
I was trying to be decent and polite with him about our breakup but after he has been phoning me up just to call me names and tell me lies (said he had tested positive for HIV) I don't feel like I owe him anything any more.
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