My fiance never wants to help with the kids

I've been with my fiance going on six years now. We have two children a daughter and a son and he never wants to help with them. I work he works but it seems like anytime I say that he should help me with them he gets mad at me and tries to say that his job is more important. I told him my alarm doesn't work, so please make sure I'm awake before you leave period and help me get the kids ready for school because they both go to daycare. Well of course this morning he didn't period and I am running 30 minutes late to work and I had a meltdown because my daughter was tired and she was cranky and she didn't want to listen and my son was eating pennies that someone had dropped on the ground earlier period and I'd apologize to my daughter cuz I yelled at her and I usually don't do that. so I text my fiance and I told him that I thought it was very rude of him to just get up and leave and not help with the kids singing as my daughter had already been awake he could have at least got her dressed and gave her her medicine period both of my children have health problems so they both take medicine regularly period by the way he he text me and told me I shouldn't expect him to get them ready that he had to be at work so he didn't have to get off later mind you he doesn't usually get off until 5. Either way. I got him a car because I was having to drive him to work everyday and he was getting off around 3 and now that he has a car to drive he's not getting off till around 5 he said it's because he's working late period but I told him I had to work too and he said that we'll his was more important because he makes money and if I had bring up the car again then I'm just going to drive him to work. Which I will not do period. he's been like this since after I got pregnant my daughter he's been caught talking to other girls online more times and I can even count and at this point I'm not sure what to do everything's always my fault I could say I'm making something for dinner and he doesn't like it uses what I just won't eat but the day before I mentioned it and he says it's fine. He hates the way I do my makeup he hates my hair he hates my clothes he doesn't let me talk to anyone at this point I'm just not sure what else to do besides event.... Any advice would be very welcome. He's done a lot of bad stuff in his life while we've been together especially. And I was dumb enough to stay with you and I don't know what else to do