My bf of 7 years

I have been with my boyfriend for seven years. And I have contemplated wanting to marry him and have children. I am reaching the age of 30 and I have a condition to where I need to remove certain organs in my body in order to prevent cancer. And I can see how aggressive he acts towards having children or the idealization of marriage. Should I leave him? I am a very sensitive person so try to be nonjudgmental. I know it seems like the obvious answer, but I’m just scared to end up alone.