What is his problem?

So my ex-boyfriend who broke up with me a year ago calls my current boyfriend yesterday and tells him that he wants to talk to me.  My boyfriend puts me on the phone and my ex says that he wants money for his jeep. (I drove his jeep while we were together)  I tell him no cause he owes me money for the house that I pd for when we were together (we were together for two years.)  It was only a rented house.  At the time we were breaking up he called the landlord and told him to take me off the lease and the landlord never sd anything to me.  I planned on staying there and him moving out.  So I left and we didn't talk for awhile.  Over the past year he's been calling me and telling me that he misses me then a couple days later he tells me that he doesn't want anything to do with me.  I haven't even bothered to waste my time and call him at all over the last year.  So anyway, he tells me that he's taking me to the magistrate and I tell him to go right ahead because I have a copy of the cancelled check showing that I pd for the house, and that I can fight him for the money.  Then I hang up on him.  A couple minutes later he calls back and asks me why I'm so angry so I tell him cause he constantly calls and causes trouble with my new boyfriend.  I told him that I am tired of him, that I don't want him, and that he makes me miserable.  I tell him that my current boyfriend has been through more with me then my he ever was, and he tells me that my boyfriend is stupid and I say "no, its b/c he's a good guy".  I sd that he doesn't call his mommy every time that we have a fight.  I then sd that I was moving to California next year so that he was completely out of my life and that's when he hung up on me.  Again, he calls back a couple minutes later and says that he's sorry and that he wasn't taking me to the magistrate.  I sd that he can go right ahead cause there's no evidence that I was driving the jeep. I ended the call by saying "go have your hoe girlfriend turn some more trick so that you can stay on unemployment and stop calling me."  Then I hung up.

Why does he keep calling me?  Why does he bother?  He says that he doesn't want me then he turns around and says he does.  What's the deal?  I don't want him and I make it clear that I don't want him.