Well, passing away is only natural, although he really did go at a young age... Those anniversaries are always sad and happy, because you remember about lots of things you did together anyway, I hope you get your ice cream someday! Ice creams are yummy 8D
I think he's got the ice cream ready for when you die of old age and join him. Unless he reincarnates before you get to that point. Then he'll see you someday and think "I think I owe that person some ice cream!"