Chandler believed that his wife had been working more late hours at her restaurant simply to avoid him, and not that she was running to somebody else's arms. Hoping to make a big gesture of apology and reconciliation, Chandler came over to her restaurant with flowers, only to discover that Monica wasn't there, and that she in fact had stopped working during the nights weeks ago.

Stunned by the lie, Chandler threw the flowers away and wandered off numbly. When he could think again, he went home and called all their friends, hoping that Monica was just sneaking off to Rachel, Phoebe, or Ross for sympathy, but no one had any idea where she had been, and they all worried.

Joey told Chandler to wait for Monica to come home and just ask her what was going on. "Maybe she's at her parents' house, maybe she's just taking long drives in the Porsche, maybe she's planning to surprise you with some big anniversary gift..."

Chandler just shook his head, already disillusioned. Thinking that Monica had possibly gone back to Richard, Chandler headed over to Richard's place and yelled accusations at him. Richard claimed complete innocence, and added that he was terribly sorry if there *was* something wrong with their marriage. Then Richard's wife came home and confirmed that Richard had an alibi with her for all the nights that Monica has been missing.

Chandler was unconvinced. "You're his wife! You're just sticking up for him!"

She slapped Chandler and showed him undeniable proof of a big ophthalmologist conference in Mexico that she and Richard had been to, for a whole week during Monica's missing time. There were photos, and everything. "Whoever she's with, it's not my husband!"

Miserable and defeated, Chandler went home again and found Monica already back and asleep in their bed. Instead of waking her, he fumed and decided that tomorrow night, he would follow her and find out where she went whenever she left the restaurant.

The next evening, Chandler stayed as far out of sight as possible during his pursuit, so when Monica headed upstairs into a strange apartment building, Chandler temporarily lost track of her and had to go around asking people in the building if they recognized his wallet picture of Monica; some people said that she frequented this building, but it took a while to find someone who knew which apartment she visited.

By the time that Chandler located the right apartment, he was angry enough to break down the door, and he caught Monica and Don in bed together.

A big fight erupted, especially about the fact that it was Don; Chandler had not forgotten him as the British, cheese-loving guy that Phoebe had claimed was Monica's soul mate. Don tried to take all the blame for the affair, but Chandler bitterly accused Monica of wanting a baby bad enough to cheat on him. Then he stormed off angrily, leaving Monica sobbing with her guilt.