Help!

My boyfriend and I have been together for a year & it's been great. Now he's ready to get married & move in together. However in the beginning of our relationship I told him I wasn't sure if I wanted to get married & I was thinking about joining the navy. He doesn't want me to join but has no stable means of helping me support our kids (my daughter & his 2 sons). I do honestly love him but he said if I leave we are done. I don't want to hurt him but I feel like I gotta do what I gotta do for my daughter.