S5·E18 Alex Gets Burned by an Old Flame

Diane, an old friend of Jim's comes to the garage looking for Jim, and Alex takes a liking to her. Alex makes some less than flattering remarks about Jim, not realizing that she and Jim have begun a romantic relationship. When Jim confronts Alex about the things he said, Alex justifies his comments with examples of crazy things that Jim has done. Jim is touched that Alex remembered all those things about him and all is well.