help please?

I just found out that my boyfriend of 3 months is going to be moving this summer or next year. i love him a lot, and i know this is cliché, but he really is the light of my life. i’ve been fighting depression, anxiety, and my ADD for 2 years. ever since i moved and met him, i’ve been happy. i don’t know what’ll happen with me when he moves. but i have a feeling it won’t be good. any advice?