Charlie is acting even more promiscuous than normal, which is getting him in trouble with a lot of husbands and boyfriends. With the help of his psychiatrist, he discovers it's related to his ex-fiancée's upcoming wedding.
Alan points out Charlie's serial dating, daily, is getting excessive, even by his standards. Even bloody noses from cuckolded-hubby fists and a sorely overexerted scrotum can't slow Charlie down. Dr. Freeman diagnoses the cause as grief because his ex, Mia, whom he actually loved, is getting married. Charlie's response is trying to go "get her back" from the bridal suite.—KGF Vissers