Kaitlyn Herman has taken a lot of heat for flirting with men on Big Brother when she has a boyfriend of five years back home, and now that boyfriend is speaking up.

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A couple of weeks into Big Brother's 20th season, Kaitlyn has been shown in the live feeds lying in bed with Tyler Crispen, holding Brett Robinson's hand, and crying with jealousy when her attractive best friend, Faysal Shafaat, entered a showmance with Haleigh Broucher.

At one point, Kaitlyn was also caught writing to Tyler, "I would drop everything for you," and later, "I want to kiss you," on his arm while in bed together.

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But Kaitlyn has a serious boyfriend back home named Joe Pincus, according to Us Weekly, a deejay who goes by the stage name Aire Atlantica.

And on Tuesday, Joe's sister made a statement about Kaitlyn's behavior on her Twitter account.

"I'm aireatlantica's sister and Kaitlyn's former friend. Stop tweeting at him. We are all aware of her psycho and out of character antics. Trust me, he can and WILL do much better than her and doesn't need anyone's pity. If you want to support him, follow and share his music," the user wrote.

Joe then responded on Wednesday via his own Twitter account.

"I tried to stay silent but clearly that isn't an option as I've been overwhelmed with the volume of everything on TV and social media," Joe wrote.

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"I've been trying to separate myself from the show and the situation as much as possible. I did indeed request (not demand) for [my] 'show release' to be pulled, and that is still to be determined (I'm aware people in past seasons have done this)."

Joe is likely referring to a release he had signed prior to Kaitlyn appearing on Big Brother, allowing her to speak openly about him on the air.

"All other accounts reporting 'insider info' are lying to you or twisting a story (aside from my sister's tweet yesterday)," Joe continued.

"Won't be saying anything else on this -- I'll be focusing on my family and friends, wellbeing and my music. Thanks to the people who have been passing my songs around and not pushing a false narrative, and good luck to all the contestants in the game."

Some of Big Brother's Season 20 cast members have commented on Kaitlyn's flirty ways in the house. Angela Rummans, for example, warned Tyler that his dynamic with Kaitlyn looked bad since she's not single.

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And when Chris "Swaggy C" Williams got evicted on Thursday night's live show, he told Big Brother host Julie Chen: "Tyler is soft! He fell in love with a girl who has a boyfriend back home, like, good luck!"