It was Michael that gave Enoch, now Metatron, the exhultation/ecstasy of Heaven, and made him into and Angel. Metatron was the first Human that came to Heaven, a thing made even more significant because Michael himself accepted him. For a long time he was Michael's confidant[1].
Lately, however, their relationship has soured as Metatron seeks to "betray" Michael, and wrest the control of over Heaven from him (a thing made possible due to Michael weakening). He does not seem to wish him true ill will, as he has often stated that "the Old Man should Rest already", otherwise he would fade away. He also once said he didn't want to lose him[2].