I am sorry your friend is moving kiki2, I feel for you, but I do think it is worth the extra effort to maintain contact.
I moved 350 miles away from my two best friends twenty years ago, and although our contact is irregular, I know they love and appreciate me still - and most importantly to me, we have history and both of them remember my late Mum.
Since moving here I have only made acquaintances and am so glad I have these two faithful friends in my life.
In the dreadful snow we had last March, nicknamed the Beast from the East, both of them rang me - none of my local friends. I was stuck here alone with my sheltie for five days, luckily had stocked up.
Is your friend having a leaving party or meal?