Conor McGregor is opening up on why he finally tied the knot with his longtime partner, Dee Devlin ... explaining he woke up from psychedelic treatment with a "most intense need" to get married.
Notorious -- who went to Mexico late last year to take Ibogaine to address brain trauma -- laid it all out in an Instagram post on Monday ... detailing the significance of exchanging vows on December 12 at 12:12 PM at the Vatican's Chapel of Santo Stefano degil Abissini.