Bf's family is casteist

My (21F) bf's (21M) family is extremely casteist. My bf knew about me before getting into a relationship and he says the caste thing doesn't affect him. However, his family is from a remote village and they are very particular about it. They are verbally and can even become physically abusive towards people from my caste. I've already had caste based trauma in my childhood. My entire school year I've been shunned by classmates and teachers because I was from a "lower caste". It was to the point where classmates would blatantly to my face tell me "ew I won't touch what she touched". I've always tried to date within my caste because of this trauma, as I know I would be hurt the most when the man I love shames me for my caste. This is my first relationship with a guy from a different caste and I'm already running into problems. The problem is, my bf won't simply say "I love her and I don't care about caste" to his family. Instead, he suggested that we make a "fake caste certificate " for me to show his family. I felt hurt because it was indicating he was ashamed of me and wanted to hide me. It hurts me more because these "family " people are not even his parents, just his aunt and uncle and they have never done anything for him. I, on the other hand have emotionally and financially supported him at all times and he still chooses to please them over my well being.