Season 3 | Episode 20 | Aired 04/29/07
Ian is thrilled to have her back and starts talking up the wedding again. But when he hears Susan replaying Mike's farewell message over and over on the answering machine, he realizes she's never going to get over him. He tells her he's leaving for England, because she'll always love Mike a little bit more.
The next morning, a neighbor brings a misdirected letter for Susan and tells her Mike moved out in the middle of the night, where, no one knows.