After Layla Taylor fought to retain the pricey Cartier ring she purchased for ex-boyfriend Mason McWhorter, her Secret Lives of Mormon Wives costar Dakota Mortensen is somehow now in possession of the bauble. “[I] shouldn’t have this, I have no reason having a ring like this in my life,” Dakota, 33, quipped in a Friday, September 25, Instagram video, addressing his ownership of the silver band. “I go to this scene [and] I can’t remember who gave me the ring … to give it to Layla.” Layla, 25, revealed in Mormon Wives season 5 that she purchased a luxe Cartier ring for Mason, also 25, while they were in a relationship. After the now-exes…