Domin Sweet's "Stay" is a short poem about grief that has nothing to do with death. The speaker misses people who are still here, or at least who have changed. They are glad to see who these people have become, but that gladness is pulled against sorrow for the versions of them that no longer exist. Time keeps moving, and every step forward costs something.
The turn comes when the speaker says "I miss me." The loss isn't only about others; the speaker has changed too, and "us all" widens the feeling into something shared. Then the tone hardens into a promise: the speaker will fight until none of "the light that you created" is left. That image suggests these people gave the speaker something worth defending. The final line, "Stay with me please," drops the fight and simply asks. The mood is tender and quietly aching, with a plain, almost whispered directness that makes the plea land.