Job woes. Will you stay or leave?

Been in my job for coming 5 years. I do mainly everything in this company. Throughout my employment, my boss / friend has the tendency to shout or scold when things doesn't go his way. When I decided not to endure his verbal abuse, I tendered my resignation. I've tried tendering 3 times the past years. Each time I do so, he will promised that he will change his working behavior then returns back to his old self. It happened again last week, but now I found out I'm pregnant should I leave or stay? What will you do? #jobs #pregnancy #Mom2be