Plot summary
With the new restaurant struggling to attract customers, Holly offers the outdoor patio area to Margo and her fiancée for their wedding, unaware that Haskell is still in love with Margo. Haskell credits his friends for helping him become "not the same man" than the one who was married to Margo before. Making matters more difficult for Haskell, Margo asks him to walk her down the aisle. In the end, Margo and Haskell realize they are right for each other and get married a second time.
Credits
Adapted from Wikipedia contributors, The Exes season 4. HTML formatting and reference markers removed.