my SO is not "enjoying" this pregnancy..

My SO & I were having issues prior to me getting pregnant which includes him cheating amongst other issues. That being said I have yet to forgive him even though we are residing to try and make things work... we were engaged before and now, it doesn't even feel like we are anymore. So all of that on top of my pregnancy hormones just makes me pissed all the time and unhappy with him. He says he isn't enjoying this pregnancy because of my attitude... but I don't know how to be different and him saying that just makes me feel worse. What do I do?