Missing an ex.

My ex is by far the biggest asshole I know. I'm pregnant with our son. And even though he wants nothing to do with me and barely wants anything to do with his unborn son. But every time he is around. I find myself rarely missing him. Even though I know we have nothing and he is wants nothing to do with me. I still find myself missing him and wanting things to work out. I'm blaming the hormones because me in my right stay of mind would have already moved on. It's been 6 months....