This week on ET, "Jon & Kate Plus 8" star Jon Gosselin and girlfriend Hailey Glassman sat down with ET's Mary Hart for a raw and emotional one-on-one to discuss the pressures of fame and their struggling relationship. Tonight, we have the most tumultuous part of the interview, as Jon storms out - and they clash over Thanksgiving dinner!

"My family and I would never let him eat Thanksgiving dinner alone in an apartment," says Hailey, even though it seems as though the two are breaking up on camera. "He's coming to our house for Thanksgiving. I don't care."

"I still planned on going to her house on Thanksgiving; that was on my schedule," says Jon, raising the eyebrows of both Hailey and Mary.

"On your schedule? What do you mean, 'On my schedule?'" asks Hailey, adding facetiously, "Let's see, Kate has the kids, and she's having a nice huge meal with Steve and his family. Uh, let's see, should I go to Hailey's or should I sit in my apartment all alone?"

"Sorry, I used the wrong term," says Jon. "I plan on going -- I made a promise to her family I would go to her house."

"Made a promise? You're not doing my family any favors!" replies Hailey.

"We know what the right thing to do is. We know what we both need," she continues. "He needs to do his thing and I need to do my thing. We both know this."

Watch the video to see Jon face even more tough questions - and to see what brought him to the boiling point.