Fighting since baby

We have been fighting all the time since baby came. She's 3 months now and he annoys me so much. It's usually me who is annoyed by him... I just feel like he isn't doing the things I expected he would. He seems to put everything ahead of us and I'm sad and alone a lot. He has two other kids and I watch them a lot while he is at work... And he goes out w friends, doesn't come home right after work... Seems like I have to beg him to run errands with me when he has the time... But then again, he calls me every day from work, he cooks for us... I know he loves us but shouldn't he be home with his family when possible? Why can't he help me when I need him to? I asked him to go look for a new fridge with me today and he was too lazy. I finally convinced him and it took him so long to get ready, I had took without him because the place was going to close.