Brittany Cartwright Claims Jax Taylor Hasn’t Donated to Cancer Charity, Despite Promise

Brittany Cartwright‘s calling out her estranged husband on social media … telling fans he’s not donating money to cancer research — and, telling Cameo to handle it.

The reality star posted a screengrab from a video on Jax Taylor‘s Cameo — the platform where fans can buy personalized messages from celebs — where he claims he’s taking every dollar and donating it to a charity fighting cancer.

Welp, BC called out her former flame with a screen grab from the clip … calling him “disgusting” for not really donating the cash — and tagging Cameo in the post to let them know about the alleged fraud.

Sources close to the former couple tell TMZ … fans of “Vanderpump Rules” know Jax has donated both his money and time to charity over the years — but, Brittany’s not sure he’s ever donated to this one, and she got upset when she saw the vid.

Loyalty and honesty — especially when it comes to charity — are close to Brittany’s heart, we’re told … so, this video really hurt her.

We’ve told you all about the couple’s acrimonious split … with Cartwright detailing the massive fight that ultimately ended their relationship.

The two have navigated their split — with consideration for their 3-year-old son Cruz — over the last few months … and, JT recently went for in-patient mental health treatment. Basically, it’s been difficult for everyone involved.