Advice for denial from marriage

We both are grade A officers and work in the same office. He proposed to me, and when I asked him about his intentions for our relationship, he confidently stated that he was looking for marriage. Before we began our relationship, I raised concerns about our caste differences. He assured me that he would convince his family to accept our relationship despite me being from a Saryupari Brahmin family and him being from a Bhumihar Brahmin background. I agreed based on his assurances. After approximately six months, he informed me that his family is opposed to our relationship due to caste differences, even though we are both Brahmins (him being Bhumihar Brahmin and myself belonging to the Saryupari Brahmin community). Now he says he cannot marry me. His parents are also pressuring him to marry another girl from his own caste as soon as possible. Throughout our relationship, he gave me subtle hints about marriage and we became physically intimate with the understanding that we would eventually marry. I am now unsure about what to do next given this situation.