This is episode 67 of 70 of Alpha, She Wasn't the One. Play it below, then continue straight into the next episode — the whole season is free and needs no account.
The closing stretch of the season, where the arc pays off.
Katie heartlessly abandoned her boyfriend Sean because she looked down on his lack of wealth. Years later, Sean becomes a young CEO and stands before Katie. He wants her to see her mistake in choosing, but he gradually realizes that the girl before him has actually always loved him.