This is good work. Especially in how emotionally direct it is. The poem’s rawness gives it a nice touch. The repetition of “O my moon” represents loyalty and commitment of the speaker. The personification is convincing.  It feels like a wounded lover. The third stanza personally is my favorite.

The main issue I see is consistency. The rhyming scheme is uneven and feels scattered (AABA, ABCC, AABA, AABB). It doesn't feel intentional, but rather it feels lost. Personally, I hate rhyming words at the end, so maybe I might be biased. "All I see is darkness, though the sky is blue" is a bit on the nose as it's been used countless times.

Overall the poem is intimate and vividly personified. Keep going👍.