I will not leave (ouk aphēsō). Future active of aphiēmi, to send away, to leave behind.
Desolate (orphanous). Old word (orphos, Latin orbus), bereft of parents, and of parents bereft of children. Common in papyri of orphan children. In Joh 13:33 Jesus called the disciples teknia (little children), and so naturally the word means “orphans” here, but the meaning may be “helpless” (without the other Paraclete, the Holy Spirit). The only other N.T. example is in Jam 1:27 where it means “fatherless.”
I come (erchomai). Futuristic present as in Joh 14:3.