The adjective versions of the nouns are nonfidelitous, afidelitous and anfidelitous.
The afidelitious flag was coined by Tumblr user beyond-mogai-pride-flags on May 21, 2020. It has no confirmed meaning.
The second afidelitious flag was coined by a user going by Artemis on November 22nd, 2020. The black stands for being committed to no relationship, purple stands for afidelitious people on the asexual spectrum, blue stands for self dedication, dark green stands for afidelitious people on the aromantic spectrum, light green stands for self respect and love, and yellow stands for unique and happy lonesomeness.