I realize now why no one else makes stuff of Applejack and Promontory, he looks to much like Big Mac so it looks incest-y.
But yeah I clearly love these two. The thing is that in my headcanon, AJ is the only one to be REAL inlove her hubby. Twilight and Webster have a real complicated relationship, Fluttershy never marries Thunderlane or Big Mac becuase she's afraid of commitment (as is Thunderlane), Spike loves Rarity but even as they grow old together she stays with him as a partner and is not in love with him, and Rainbow Dash loves herself and her kids more then Soarin, who even after they marry, is more like a best friend.
I do hope that Applejack loves her husband a lot, considering their house full of foals who are dependent on sticking together.