“What hurts even more is that the Steam Deck, which was the 1 TB OLED model, was a gift from a very special person and I feel like I have betrayed that person by losing it.”

This is not true at all. The only person who has been betrayed here is you - you were betrayed by whoever it was that took your Steam Deck.

The person who gave you the deck wanted you to enjoy playing games on it. If you can’t have that exact Deck back, my suggestion would be to save for a new one and perhaps get it engraved with something to remind you of that person, and the fact that they bought you a Steam Deck 🙂

I hope you feel better soon.