Should I stay or just give up

My husband and I have been back together for 3 years and married for almost 2. Here lately I’ve honestly just felt like a single mom doing everything on my own. I ask for help and he always says he will but I end up doing it. I feel like he’s not happy anymore and isn’t the man I fell in love with 6 years ago. I want so badly to fix our marriage but I also feel like I’m just wasting my time. I had my son almost 7 weeks ago and we just not started to be able to have sex again, but it’s like he’s more interested in watching porn then anything ( his choice of porn is making me really question if I’m what he wants or just a cover up ) I really need advice on what to do. I feel like I’m starting to lose myself