Changed after baby

Next month my husband and I will have been married for a year, we got married when I was 8 months pregnant. We had a very very rough past but made the best of it and had an amazing relationship after getting married. 

But he did not turn out to be the father he talked about being. Ever since our little boy was born he has not helped in raising or caring for him whatsoever. He didn't cut the cord, hardly held him as a newborn (I had to basically beg him to) and never changed any diapers. 

Now our LO is 8 months old and I'm getting fed up. He won't watch him long enough for me to shower, had changed maybe 3 diapers since his birth, and makes me do everything alone. I feel like a single mom. I cook, clean, raise OUR baby alone and work full time. Not to mention, I have found nudes on his phone 3 different times since we got married, and each time he said he had no idea what they were.  I'm starting nursing school in July and he's supposed to watch him nights while I'm at school. 

Any advice would be appreciated, I'm really worried on what to do here.