My best friends moved away and I need help?

How do I get over this. I lived with my boyfriend for a year but in the process he lost his two friends and they became the bestest Friends of mine. One of them got super close with me and I loved him a lot. Yesterday they left to Cali. How do I get over this? I know life goes on and I can still talk to them. But they were the best and most real peoples I have ever met. I miss them so much.