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Sheldon can barely contain his joy when Leonard starts dating a woman who meets Sheldon's exacting standards.
Wolowitz thinks he's found the love of his life, until she meets Leonard.
Sheldon uses Dr. Stephanie to check all his hypochondriac symptoms. When Leonard's relationship with a new woman starts moving too fast for him, he goes to Penny for advice.
Leonard and Penny's relationship takes a turn for the worse when they break up, but is quickly resolved. Soon their relationship progresses into a stronger friendship than before, while Sheldon and Penny's friendship slowly begins.