i have a two theories first is that with that ender god is that he wanted to help villagers because he saw them being peaceful so to protect them he teached them how to create golems but some time later humans in some way got the eyes of ender and teleported to end and jealous of his power they shattered him into many parts.secnd theory that i prefer is that heart of ender is truly ruler of the End amd the Void amd the name Heart is because maybe he created or at least protected the End so much that they named him like that and to thank him the End creatures maked him their ruler its my theory and i believe in it