A Million Doors to You (An Obey Me Fanfiction)

As time went by, Barbatos, a demon butler, fell in love with a human.
But as his love grows for her, he also has to carry the pain in his heart that grows each passing second, minute, hour, and day.
With his demonic power to go through different timelines, will he manage to find the universe where he and his beloved ends up together? Or will he be stuck in his dimension where his heart receives new cracks of heart break day by day?