Not sure if I'm relieved or disappointed

My ex is not the kind of person I want in my son's life. Don't get me wrong; I don't love him and honestly I don't really even like him as a human being. Be that as it may, I was hopeful that he would be as intent on being involved as he's said he would be. I know he was trying to use the baby as a way to hold on to me for a while, but I would keep things focused on the pregnancy rather than let him hear about my life. I'm dating a great guy now, we're talking about marriage (like next year once the baby is here and I've had some time to get settled.) Well I asked my ex to keep our communication to an email once a week concerning the baby. He was going crazy at first with all sorts of crap. Then he started seeing this girl (which I vehemently encouraged) and he started to ease up on the emails. Instead of every friday night at 7 it would be saturday or sunday before I heard from him. I was thrilled. Two weeks ago I told him that a condition of mine may result in some complications in the pregnancy and he simply replied "keep me posted" which is unusually cold considering he was always extremely worried about the baby's health. The next weekend I told him another thing the doc said, and he didn't respond. I figured maybe the new chick is keeping him busy and he's not worried about trying to annoy me anymore. Well this week he completely failed to send an email asking for an update. Part of me is reaaaaally hoping this means he'll leave me well enough alone and let my boyfriend and myself raise this child as our own. My bf loves my son so much already... He puts his ear to my belly to "listen to baby Killian" and talks to him through my belly. The other part of me is angry for my son's sake that his biological father seems not to care about him anymore just because he's got a woman in his life. Still... am I a bad person for hoping this guy is gone for good?