When Jesus cried My God, My God, why have you forsaken Me...?

He was hurting .

He was feeling the sting of death. It feels like total and complete abandonment. And it hurts. He was seeking comfort. You will feel that sting one day too. We all do. Live and the world lives with you. Die and you die utterly alone.

He was ALSO fulfilling OT prophecy

Psa 22:1 [[To the chief Musician upon Aijeleth Shahar, A Psalm of David.]] My God, my God, why hast thou forsaken me? why art thou so far from helping me, and from the words of my roaring?

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Mat 27:46 And about the ninth hour Jesus cried with a loud voice, saying, Eli, Eli, lama sabachthani? that is to say, My God, my God, why hast thou forsaken me?

No.

He was not "praying" that psalm.

He was quoting that psalm (which is how Scripture is so often used by Jesus in the Bible).

Consider the audience.

Consider the great and unusual detail concerning the audience presented by the Gospel author.

Consider that for devout Jewish people of the time (who spoke the same language as Jesus) that Psalm would have been instantly recognized, would have "come to mind", just as singing the first bar of a very popular song would bring that song to the mind of the typical person in our society.

Then read the entire psalm.

Consider the author's intent, the message conveyed by the author.

Do those things and I think you'll get a pretty good idea regarding why Jesus was quoting that psalm at that moment.

What did Jesus mean by his words, “My God, my God, why hast thou forsaken me?

Jesus spoke these words in fulfillment of Psalm 22:1, which was originally written relative to David. Not that David was forsaken for impalement on any torture stake, but he was forsaken to the fury of enemies because of his faithfulness to the Kingdom covenant.

In all this David was a prophetic type of Christ. Jesus was forsaken to a disgraceful death, on an accursed tree, in order to test his integrity. By remaining faithful he triumphed in his integrity, as the rest of the Psalm shows.

Jesus did not mean that God turned his back upon him as disapproved and condemned, but merely that God released him to the full fury of his enemies, even to the extent of allowing them to kill him.

Thus God forsook or released Jesus over to his enemies, to be subject to the enemies to do whatsoever they wanted to do with him, not even shielding him from ignominious death.

When Jesus said that God had left him, he did not say this because he had lost faith in his Father. He knew that God would not protect him from his enemies at the time of his death.

This was an opportunity for Jesus to show that he would always be loyal to God. When Jesus said with a loud voice, “My God, my God, why have you forsaken me?” the prophecy at Psalm 22:1 came true.

NOPE.......He was teaching Scripture from the cross......