Try to get him to read what you read. It needs to be something that might spark some kind of interest and he actually completes reading it. If he can recognize whats happened he may try to do something about it. There is plenty of treatments he can try. CBT and medications that act on dopamine seem the best. Edit: that is if it is anhedonia. Someone needs to see what is going on. An assessment by a medical professional MUST be done.

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