Archie must have been tanking Meat Head lessons.

First, Gloria buys Edith a pants suit, and EDITH WAS GORGEOUS!
Second, Mike and Gloria want to take them both out to dinner, but Archie refuses.
Third, Archie makes Edith start to cry...

...so he deserved what happened next.

Moral of the story: If your wife is a gem, you'd better take good care of her, or somebody else will.