Please house help a brother 🙏 I'm dieing slowly! I started a relationship

Please house help a brother 🙏 I'm dieing slowly! I started a relationship with this girl which I earlier love her and feel for her to the extent we are about getting married, now that we are about getting married, I don't just know what it is that I don't love her anymore, but I don't actually want to disappoint her people because they received me happily, and I don't want to disappoint my relatives and my pastor by disengaging this marriage. Though everything has being put in place for the marriage to take place but deep in me, o don't want to get married to her again.  The love I have for her earlier had disappear and I don't love her anymore, but I'm afraid telling her or her people and my pastor/ my relatives because I feel I might disappoint them. This is really killing me slowly inside. Please house, I'm dieing inside me  what exactly should I do?? I need your advice