My boyfriend said the F bomb to me

This has happened numerous times. It all started when we watched a video of a baby throwing up on someone. I told him "I hope you don't get angry if that happens and keeps his cool." He walked off and said it. I told him I was worried about his behavior because he said the same thing to his 5 year old niece once before. I feel like I want to leave him after this. I'm done. I don't want to have children with someone like this. He'll only get worse.