They followed for the loaves, for the benefit of the bodily cures, or out of curiosity, though some (probably) followed him out of love, and to learn of him. Decapolis hath its name from ten cities comprehended in it. Here was a mixture both of Jews and Gentiles following Christ, who came to be a Saviour of them both, and to pull down the partition wall between both, to make them both one gospel church, Ephesians 2:14.
Related Commentaries of Matthew 4:25
Matthew 4:25
25 And there followed him great multitudes of people from Galilee, and from Decapolis, and from Jerusalem, and from Judaea, and from beyond Jordan.