You know you have been with someone too long when - Relationship observations.

[Grumpy]

.....when you are in The Wiz and suddenly you have to think if you should buy the new sub woofer.

Good point. That goes along with

....when you have to think of a high priced item to buy her to distract her from the new big screen tv or home theater system you want to buy
... when "Let's go shopping" means "I need someone to hold my bags and pay for it"
... when you worry about when was the last time you wore a shirt
... when you can no longer see how long it takes you to wear jeans to make them stand up on by themselves.