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It was so important to me that Stolas was able to be sad throughout the entire episode. Usually media likes to rush a character's grief/depression/sadness. Like "Stop moping around" or "get over it already." Depression doesn't just go away. It is a persistent feeling of sadness.
His depression was also presented through various emotions/emotional states.
Lethargy
Crying
Anger / frustration
Self-blame
Not wanting company and being emotionally drained and unable to reciprocate
We even see him Smiling / Laughing which is so important because we see that he is still in there behind the sadness and tears. His laugh is not as lively as it once but he is still capable of smiling and finding joy.
His problems weren't fix in the end and his sadness didn't go away even if he has someone who loves him by his side (and even if he loves him too). And I think this is one of the best depictions I have seen of a depressed character in media in a long time.