Most Helpful Girl
I would give yourself an out, try figuring out other avenues to make new friends to be your support system in case he doesn't want to renew contact.
Also I think before you contact him you need to be okay with the possibility that he might now want to be anything more than your friend.
Without knowing the reason you stopped talking it's hard to be specific, but I'd you do contact him make sure you don't come off as desperate or want to pressure him into something. Just be sincere.
Something like "hey I hope you're doing well. I just wanted to let you know / reach ou t you to day that I regret that were not talking. You were a big support and I always appreciated your feedback and advice. I miss talking to you but I understand if you still want some distance. Best, "0