'The Big Bang Theory' season 10 spoilers: Sheldon threatens to break up with Amy in episode 5

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This week on “The Big Bang Theory,” Sheldon (Jim Parsons) and Amy (Mayim Bialik) took a huge step in their relationship all in the name of science.

After her apartment was flooded when a water pipe burst in her closet, Amy was forced to move out for five weeks, and Penny (Kaley Cuoco) suggested that she should live with Sheldon for the meantime. Sheldon wasn’t thrilled, but Leonard (Johnny Galecki) said that he should look at it as a scientific experiment. Sheldon agreed, and he and Amy moved to Penny’s old apartment.

Amy requested that they share a bed for the duration of their experiment. On their first night together, Sheldon flailed around so much that he pushed Amy off the bed and onto the floor, and the next day, Amy told Penny and Leonard that she didn’t get a good night’s sleep as she had to stay on the floor. Sheldon and Amy started arguing, and she told him that living together was a bad idea. But after Sheldon reminded her about their experiment, Amy, who insisted that she was as much of a scientist as Sheldon is, told him that she is willing to stick it out for the next five weeks.

Speaking with The Hollywood Reporter, showrunner Steve Molaro said that it was a “super-fun” episode to write and that Sheldon and Amy living together opened up a lot of scenes for them to work on which will explore their new living arrangement.

“The beauty of Sheldon and Amy is so much is new to them,” Molaro explained. “Even small, simple things like having people over for brunch for the first time can be an adventure. Which, incidentally, is something we will be exploring.”

Next week, in the episode titled “The Hot Tub Contamination,” Leonard and Penny will have to intervene as they try to separate a quarreling Amy and Sheldon when their cohabitation doesn’t go as planned.

In the promo for the episode, Amy tells her boyfriend that he can’t regulate every aspect of their lives.

“I can if you just roll over and accept your fate!” Sheldon says.

It gets to a point where Sheldon threatens to break off their relationship when Amy refuses to follow the bathroom rules and schedule.

“There’s nothing wrong with keeping our toothbrushes in the same holder,” Amy says.

“I think we should see other people,” Sheldon deadpans.

Elsewhere in the episode, Howard (Simon Helberg) and Bernadette (Melissa Rauch) will find unexpected guests in their house when they decide to stay home from a planned vacation.

“The Big Bang Theory” airs Mondays at 8 p.m. ET on CBS.