So the men turned from there and went toward Sodom, but Abraham still stood before YHWH.
#genesis 18:22

Three men appeared to Abraham, but only two arrive at Sodom (Genesis 19:1). Where did the other go?

He stayed behind with his friend, Abraham. They discussed the matter of Sodom and then YHWH "went on his way". Does this mean he followed the other two to Sodom or went on to some other business? Wherever he went, we can be sure from this that God is not the impersonal, mindless force of deism and new age mysticism. He moves about in his Creation and interacts with mankind with intention.