I have been going throw some hard time with my boyfriend who ive been seeing for 5 years should i still stay?

i have 2 beautiful kids with him and i love him but when do i say enough is enough .He treats me like crap he calles me a b**** he tells me he is only with me 4 and he is a mommys boy . im scared to leave because of my kids and bec i am afraid to move on . he says he loves me and he wants to make thing beeter but when we try it changes for one day and when i wake up its the same old stuff. what should i do.