The friendship between Amy and Penny ofThe Big Bang Theoryis a fulfilling one.

Much like Penny and Leonard’s relationship, Amy and Penny balance each other out.

Their differences are what bring them together as they learn new things about the world.

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Their trust within one another and Sheldon’s ability to open up to Penny makes Amy jealous.

She even expressed this to Leonard in “The Anything Can Happen Recurrence.”

Crowley Angry in the Middle of the Road in Good Omens.

Mary Cooper is sort of like a mother-figure to Penny since she sees Mary more than her own mother.

This, of course, can make Amy feel awkward.

However, her obsession with Penny’s looks seems to come from curiosity and wonder, not romantic feelings.

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But when Penny accidentally tells a co-worker, Bernadette becomes furious.

In season three, she was very robotic and dry.

Amy had never had a girls night before and was jealous women she knew were having one.

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So what did she do?

But after five years of dating and no advancement in their relationship, Amy called it quits.

As the girls were talking about their prom memories, Amy was shocked Penny went to seven proms.

8- Sheldon Penny

However, when Bernadette was going to choose Penny as hermaid-of-honorinstead, Amy fell into a dark depression.

How come Penny always came out on top?

This, of course, could come with a hint of jealousy.

Mary Cooper looks through penny’s laundry on the Big Bang theory

Amy is immediately flattered that Raj used to like her but Raj denies it.

As one can imagine, Amy was down in the dumps until they all talked it out.

NEXT:The Big Bang Theory: 10 Times The Characters Probably Should Have Gone To Jail

PENNY AND AMY FROM THE BIG BANG THEORY

PENNY BLABS ABOUT BERNIES PREGNANCY

AMY invites herself to girls night - big bang theory

Penny and Leonard lie in bed and talk on TBBT

Sheldon tells Amy he loves her on The Big Bang Theory

bernadette’s wedding

Bernadette and Amy drinking cocktails out of large glasses in a bar in TBBT

raj and amy - tbbt