Boyfriend wants to be a pilot but he’d be gone all the time... PLEASE HELP

I want to support him in his dreams and goals but I don’t want to be married to someone who would hardly ever be around. But I don’t want to make him give up something he really wants to do for me. I don’t know if I should try to talk him out of it, leave him, or just let him do it and put up with it. It would really suck to have to raise our kids all by myself. I’m really stuck, I don’t know what to do. Please help

PS we are not yet married or have kids, but will in the future. He wants to study to be a pilot