Chelsea is very shocked when she borrows Charlie's phone and discovers some nude pictures on there. Good old Berta is always there for support... or to laugh at his misfortune.
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Charlie and Chelsea watch a game of basketball and discuss Chelsea going to her ex-mother-in-law's funeral and spending the night with her ex-husband. Enter the jealousy!
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Charlie lays in bed with Chelsea as she's crying about the state of their relationship. Apparently she doesn't enjoy staying in every night watching tv and eating Chinese food.
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Two and a Half Men Quotes

Charlie: You're like an Alzheimer's patient in a whorehouse.
Alan: What do you mean?
Charlie: You're constantly surprised that you're getting screwed, and you don't want to pay for it

Alan: What's wrong with him?
Berta: Classic case of va-jay-jay fever.
Alan: Colorfully put. I'm just surprised to see Charlie fall for it.
Berta: Sooner or later all men fall for it. How do you think I got my condo in Palm Springs?
Alan: You have a condo in Palm Springs?
Berta: No, figure of speech. Don't try to stop by.