Falling out of love

My fiancé and I have a 6 month old son together and when I first got pregnant everything was great he was caring, we talked all the time, and he initiated the dates (not saying he should be the only one initiating dates but you know what I mean) and everything but later in the pregnancy he started playing his video games more and paying less attention to me. then after the baby was born it went all down hill completely. he was helping me with the baby for the first week and then all of the sudden he stopped and I mean completely I literally have to ask him to give HIS SON attention. And any affection towards me is gone he’ll give me a kiss here and there but never as much as he used to and it’s really only when he wants sex. We barely ever have conversations, he’s literally always on his playstation. we’ve gone on 2 dates since our son was born and I have push a conversation out of him and he acts like he can’t get the date over with quick enough. On top of it I feel like a single mother I do everything around the house and I do EVERYTHING for our son and his excuse? “He works all day and he’s tired” like a child and housework isn’t a full time job in itself. I start hair school and May does that mean I get to use that as an excuse not to do anything? No. I feel like I’ve tried every approach to talking to him but he just acts like it’s all a joke. I try so hard with him and he puts in 0 effort. I’m so lost and I don’t want my son to grow up thinking this is what love is but I also don’t want to split this family up. Does anyone have any advice at all?