Can I fix this situation?

I am starting to wonder if his goal in life is to make mine hell...WE broke up which was his fault (he did it) and missed me. I stayed friendly and nice and hoped we could be normal. HE was all over the place mad, upset, emotional, not speaking.....everything. I surprisingly was the normal one, when I had the most reason to be hurt. He got mad because he UMED I was going on a date and decided he should make my biggest enemy his best friend, flirting with her so I can see. I have never had anyone do anything so cruel in my life....I would never do that to anyone, not even in my character. The craziest thing is as he is doing this, all he does is stare at me from afar.....anytime he thinks I won't see him he is peeking over at me. Or staring with a sad face on. You did this cruel thing, how could you even be concerned with me at all? Why is this guy still worried about me and what I'm doing? Is this normal behavior? I told him to get all his stuff out my house he refused until I threatened to throw it away then he surprisingly can respond but still didn't show up to get it....I have to be around him. Why would a man be so evil, and he has had every opportunity to go away for good but wont. I don't understand the logic in getting close with the person who has caused me the most grief as you stare with a sad look at me. What went wrong here? I would just like outside looking in opinions...