Taylor, 42, has been dating John Bluher, 54 — an attorney and married father of three from Colorado who handled a lawsuit she was left with after her then-husband Russell Armstrong's suicide in August, 2011.
"Taylor is head over heels with John, but she never really gave herself time to process Russell's death properly. She just jumped right into a new relationship," the insider said.
"The girls on the show just think Taylor is making herself look really bad and isn't thinking ahead in the best interest of her daughter."
John tried to blow off RadarOnline.com's exclusive report that the two were dating when it was initially reported in March by saying, "There is no affair nor has there been one. Taylor would not have said it to anyone because it hasn’t occurred. Neither she nor I have any relationship other than my working as her legal counsel."
However, RadarOnline.com observed a video clip of the two kissing after leaving a West Hollywood nightclub in September and their relationship has been confirmed by numerous close sources.
"Taylor just doesn't think ahead. Once a cheater, always a cheater. He cheated on his wife with her and their relationship has basically put an end to his marriage," the source said.
"But then again, she could also be labeled as a homewrecker, so the whole relationship in and of itself just isn't a good idea."
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The source says a few of the housewives on the hit Bravo show have tried to talk to her about the relationship, but she just doesn't want to hear it.