<human>: Summarize the given text in a few sentences.

I posted in relationship advice two days ago -
 

Basically my boyfriend's decided to ruin thanksgiving by sending me lengthy text messages after a perfectly good holiday about how I acted at her birthday dinner the previous Sunday. I was dealing with a cancer scare and was quiet, and admittedly not the best. I had just received word that I needed a biposy beforehand. I apologized that night for my behavior. His sister decided to then text after a good holiday, after being around each other all day, that I ruined her evening, was attention seeking, and had psychologically damaged her and her little brother by abstaining from a birthday table tradition. This is far from the first time in 5 years his family has really crossed the line. The birthday dinner was the first time I wasn't on my best behavior around them. 

After taking some advice from the previous post, I told my boyfriend he needed to talk to his family and let them know that the way they treat me is absolutely not ok. He did so, but I think it's made the situation much worse. His mom basically said she believed I was faking the cancer scare for attention, that she tolerates me and that she sees me as 70% of an ok person and 30% of an awful person. She also believed that boyfriend's was completely in the right for how she texted me and that I should be the one apologizing to her.
<bot>: Boyfriend's family continues to be awful after 5 years of me trying very hard with them, what should I do?