All dating is trying to find compatibility, and if you're not compatible, that doesn't mean there is anything wrong with that person; it also doesn't mean there is anything wrong with you. You don't need to change yourself to try to make yourself more compatible with that person and vice versa; you should say, "We don't have enough compatibilities, and that's okay, and I wish you all the best, but this is not going in the direction that we need to do."