air force

so my boyfriend wants to join I'm not telling him no it's his life I'll be in it and what not but my mother is saying hjow if I love with him when I'm done with school that it will literally kill her, and that he might find someone else that air force is just like college and crap like that. I am already scared of losing him to another women she don't even know how scared and she says this. I don't know what to do anymore with her.(I'll get more feed back on this one)