Separation after 2 handsome babies

I am a devoted 35 year old mother and wife. We have a 2 year 8 months boy and a 1 year old baby boy. I have been with my partner together for 15 years but right after our first baby things change because he wasn't my first priority and he wasn't a helpful partner leaving me at the end of the day exhausted and disappointed quickly I realized I was the one that had to be the one doing everything for my baby plus house work because I don't have a job and he's the one that works si why should he do more than that? Fast forward few months and I ended up pregnant again even after taking pills to prevent a pregnancy God decided to send me another baby that I loved the instant I knew although I knew it was going to be challenging. Now my relationship with hubby had been difficult we fight here and there, he started calling me names (retarded, stupid) few times mentioned he had beers with his coworker (married women) after work and now yesterday he said he didn't know why we were together? That he wasn't happy. I didn't want to leave the kiddos not growing up with their dad but I feel I can't take it anymore seems like everything I do is blur good enough for him and feel we will be best apart and better now that the kids are small and get used to living the 2 home environment. Is ir ok to feel that way?