This angel was the Son of God.
In the OT, phrases like "the angle of the Lord", "the word of God", "the word of the Lord", etc, all refer to God the Son.
See The Treatise of Novaian, On the Trinity. Start at p45.
https:// archive.org/stream/treatiseofnovati00mooruoft#page/88/mode/2up
For the angel wrestling w/ Jacob, see p89.