What Should I Do?

Me And My Boyfriend Have Been Together For 1 Year And 7 Months. We Have Been Through A Lot. From Fighting To Handling A Miscarriage. I Am Now 3 Weeks And 3 Days Away From My Due Date With Our First Baby Which Is A Boy. He Has Always Been Unfaithful And I've Always Tried To Stay Because I Love Him And Now I Really Push Hard Because Of The Baby. He Hasn't Bought Our Son Anything. He Just Now Got A Job But Got Fired After A Week. Well We Were Supposed To Delete Social Media And I Found Out He Was Sneaking On It At Work And Messaging And Calling Girls And Wouldn't Even Talk To Me. I'm About To Have My Son Early From Stress. Should I Leave Him Or Stay?