To stay or leave in an unhappy relationship ? 20 weeks pregnant.

I am 32 this year. My spouse to be gambles. Take care of me less than 2 days a week. We don’t stay together. He comes over to my parents place to stay with me 2 days a week. Sometimes he’s non existence . Sleep for the 2 whole day when he’s with me as he gambles till 6am. I am thinking of leaving… but I am scare… till today my parents does not know that I am pregnant. any opinion from single moms? I am pretty lost. Crying to sleep every night.