The soul friend —the one he shared everything with— is moving away, changing school or city. Your son is sad, angry, or acts like he doesn't care. For him it's losing his person; for you, seeing him heartbroken and unable to help.
His sadness makes you want to fix it fast: 'you'll make new friends', 'you'll keep seeing each other', minimizing so he won't suffer. Breathe. Losing your best friend is a real grief, one of the first big ones of his life, and like all grief it isn't fixed by rushing it or covering it — it's accompanied. He doesn't need you to take away the sorrow or promise a replacement: he needs you to validate what he feels, to give him permission to be sad, and to help him hold the bond at a distance and, in time, open up to new friendships without betraying the one he had.
Separate the fact from the rush to console. That a much-loved friend leaves is a genuine loss, and for a child intimate friendship carries enormous weight: it's his playmate, his confidant, part of his daily world. The reaction can take many forms —sadness, anger (sometimes at the friend 'who abandons him' or at you), or an apparent indifference that hides the pain— and all are valid. It's, at bottom, a small grief, and grief asks to be felt, not skipped. What helps: allowing the sadness without rushing or minimizing it, helping him say goodbye well (closures matter), holding contact at a distance realistically, and —without hurry or pressure— accompanying him over time so his social world stays alive. What doesn't help: the 'it's not such a big deal', forcing new friendships immediately as a replacement, or promising a closeness at a distance that then isn't sustained. Age nuances it: the youngest live the 'far away' more abstractly; the older ones understand the loss better and also the tools to keep the bond.
Don't minimize the loss ('you'll make other friends', 'it's not such a big deal'): it invalidates a real pain and teaches him not to bring you his sorrows. Don't rush him to 'get over it' or replace the friend right away: grief takes its time. Don't promise contacts or visits at a distance you know you won't be able to sustain: the broken promise hurts more. Don't demand he express the sadness a certain way or read his apparent indifference as 'he doesn't care'. Don't load on the drama yourself by projecting your own losses. And don't stop him from saying goodbye to spare him the bad moment: well-made closures help him heal.
No ranking, on purpose: no two children are alike, and yours isn't even the same as yesterday. Read which one fits your home, today — or combine them.
Put a name to what he feels and give him permission to feel it: 'losing such a dear friend hurts a lot, and it's okay to be sad or angry; I'd miss someone like that too'. Don't rush to fix it. Accompanying the sorrow —being there, listening, not minimizing— is what lets him move through it. That he knows his sadness makes sense and that he's not alone in it is worth more than any rushed comfort.
Help him close well and keep the tie realistically: a goodbye his way (a gift, a letter, a last game), and then concrete ways to stay in touch —video calls, messages, a visit if possible— without promising more than can be sustained. Friends who move can keep being friends at a distance, and knowing he doesn't lose him entirely softens the grief and teaches him that bonds survive distance.
Without hurry or as a replacement, over time accompany him so his social life goes on: tending other friendships he already has, activities where he relates, chances to meet people. It's not 'swapping' the friend who left —he can love both—, it's that his world doesn't stay empty. Gradually making room for new bonds, respecting his pace, helps keep the loss from leaving him isolated.
Accompany the sorrow when it appears, without rushing it —grief comes in waves, and he may be fine one day and sad the next. The goodbye is prepared before the departure; holding contact and opening the social world happen over time, without forcing. If the move is yours (it's your son who's leaving), this crosses with the sister situation on moving. Align with whoever parents with you in not minimizing or rushing. And be patient: missing a dear friend takes its time, and your unhurried company is what most helps the loss, over time, make room for new things.
Sadness over a friend who moves is a healthy grief accompanied at home with time and presence. It's worth looking more closely —with the pediatrician or a child psychologist— if the sadness is very intense and doesn't ease after a reasonable time, if it's taking over his day (he won't go to school, stops playing, doesn't sleep or eat, isolates from everyone), if he shuts down completely refusing to make any new bond for a long time, or if the grief uncovers or adds to a bigger distress. Also if the loss coincides with other big changes that together overwhelm him. This is peer commentary, not clinical advice: when in doubt, consulting early helps tell a normal grief from a sadness that's settling in and needs support.
Everything in this house is peer commentary and suggestion — it does not replace professional help. It's every mother's and every father's responsibility to notice the situation and to seek it when it can serve. If you need a number, check the directory of helplines by country. The full disclaimer, here.
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