Life change i can't handle

So, in 2013 i moved to a new town and i was 15 years old. It was one of my biggest fears coming to life. But in 2014 i met the love of my life. 3 days into our relationship, my brother died (21 y/o) and my life changed. But my boyfriend has been there for me through everything.
Recently my mom got laid off from her job and has an interview for a job on monday, if she gets that job (which she thinks she wont, and i kinda hope) i'll have to move away from the my boyfriend and i'm getting so much anxiety. I have such a huge fear of losing him. I've never had anything like this before, he's my second every bf and my first was abusive. We've been together for a year and 9 months. I just can't leave... The thought of moving away from him makes me sick and i just can't... I need some reassurance. Please i'm desperate.