I am reading Acts 3:17-23 (NIV) and I am trying to understand why it seems like the writer is discussing Jesus, but also a Messiah other than Jesus

17 “Now, fellow Israelites, I know that you acted in ignorance, as did your leaders. 18 But this is how God fulfilled what he had foretold through all the prophets, saying that his Messiah would suffer. (referring to Jesus) 19 Repent, the…