In American Pie 2, Jim was still sexually-inexperienced but more mature. Still a loser, though, he experienced an unfortunate incident involving superglue but ultimately came to his senses and realized how much he loved Michelle. In American Wedding Jim made it official, marrying Michelle after awkwardly dealing with pre-marriage jitters and a marriage proposal that was anything but romantic.
As American Reunion opens, Jim and Michelle are still married and the parents of a young boy, but aren't having much fun as a married couple...