The past few months haven’t been easy on Christina El Moussa, as she’s gone through a nasty divorce from her estranged husband, Tarek El Moussa.

Fortunately, throughout it all, she’s had someone to lean on — her new boyfriend, Gary Anderson. And as the two continue to get serious with their relationship, a source tells In Touch that Christina’s new relationship is the “ultimate betrayal” against her estranged husband.

MORE: Tarek and Christina El Moussa’s Daughter Diagnosed With Health Condition

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Gary and Christina in Yorba Linda, CA, on Jan. 26. (Photo Credit: In Touch)

“Gary’s been there for her while she’s gone through hell with Tarek. She likes that Gary is so much more mature than Tarek. It’s a safe relationship, and she’s happy with him,” the source tells In Touch, exclusively. “Christina dating Gary is the ultimate betrayal.”

The source adds that Tarek is “disgusted” because “he’s the one who introduced Christina to Gary.”

MORE: Christina El Moussa Breaks Her Silence on Her New Relationship!

Gary and Christina first met when he was hired as a contractor to work on their pool back in 2015. They two grew close, and Tarek became suspicious when he felt his wife was texting another man behind his back.

“Christina grew close to Gary. Tarek was suspicious that she was getting involved with someone but had no concrete evidence,” an insider previously told In Touch. That changed in May.

“Tarek saw Christina’s phone and [believed] there was some inappropriate texting going on between Christina and Gary,” the insider explained. This when Gary witnessed the blow-up fight between Christina and Tarek, during which the father-of-two drew a gun and 911 was called.

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The husband and wife released a statement denying the situation, telling In Touch, “Neither of us was involved in a romantic relationship with any third party prior to our separation, or believes the other was.”

MORE: Tarek El Moussa Was “Verbally Abusive” to Christina

Even so, Tarek hasn’t been shy about his feelings towards his wife’s new man; he previously revealed his true feelings for his wife’s new man by sharing a poster for the new movie, Why Him? — which can’t be a coincidence.

Scroll through the gallery for interesting facts about Tarek and Christina!

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