Bf doesn't care about our baby

I've been with my bf for 4 years. We both love each other. There's no question about that. But he won't help with our planned baby at all. He has held him a total of 15 minutes these last two days on his days off. He doesn't even look at him when he gets home from work. He doesn't hardly feed or change him. I understand that he works but on his days off he still doesn't help. He tells me he works so I watch the baby but he gets to relax all night when he comes home and I don't. Infront of his friends he's all about the baby but when we leave it's all up to me. I feel like a single parent. Advice would be great but I'm basically just venting.