Well, Whitney Thore made it very clear — she is not to be messed with!

The My Big Fat Fabulous Life star took Instagram to expose her ex-boyfriend Avi Lang after she found out that she was his side chick and he had been cheating on his fiancee Nada Louis with her!

“What’s the name for [that feeling when] you discover the man you were dating was simultaneously planning a wedding with another woman?” read a text post that the 32-year-old shared on Instagram, tagging Nada.

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She followed up her post with a collage of four photos of her with Avi — including a shot of them kissing — and she covered his face with black circles to hide his identity.

“For some reason, my ex-bf never wanted me to post pics of us! I think he’s just shy!” Whitney captioned the photos.

Whitney’s fans flooded the comments with words of encouragement and they even shared stories about the times that they went through a similar situation.

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“You don't need his crap. Find a good looking guy that loves you for who you are,” one fan wrote, and another commented, “Wow I'm so sorry! How incredibly hurtful.”

Viewers have followed along with Whitney’s unlucky love life on her hit TLC series. During a recent episode, the body positivity activist posted a photo of herself in a bikini on her dating profile, because she said she was "tired" of men being surprised or upset with her full figure when she met them in person — and she revealed that she’s been accused of trying to “hide” her size online.

“I want them to know, right up front, that this is me, and this is what you’re getting, and if you don’t like it then f–k off,” she said.

Scroll through the gallery below to see all the times Whitney proudly showed off her curves on Instagram!