Caramel has had feelings for Applejack ever since their chance encounter in Manehattan. By bizarre happenstance, Caramel arrives at Sweet Apple Acres. Years later, his feelings are still strong, and it isn't until after some encouragement from Mac that spurs Caramel to make his move.
A certain pony also has Big Macintosh's heart. This one is the hyperactive and random Pinkie Pie.