It is difficult to answer a question that is only partly true.
the scripture you are referring to is Mat 4:10.
It says there that Jesus withdrew to the mountains to be "all alone".
The superimposition of the adjectif "completely" is an incorrect rendering that could easily be misscontrued.
Additionally the content shows that he was alone in the sense of not being with his disciples, since verse 11 shows that he was with some angels.
My God my God, why hast thou forsaken me - he was alone.
His strength was revealed when he went through it alone.