How do you get over someone?

so this is my attempt at venting. I'll save the whole sob story and just bring you to the end of this whole ordeal. I've come to terms with the fact that this guy is not ready for any kind of commitment, will not accept the fact that he is now a father nor will he realize the weight of what that means until its way too late. So here I am trying to convince myself that I cannot force him to grow up or to be a father and that I should carry on with what I need to do and stop trying to keep him included. However, I've never been good at getting over someone. This is especially difficult because I now have a child from him

.. any tips?