According to Business Insider, "Kermit The Frog and Miss Piggy have a confusing on-and-off relationship that spans decades. Their wedding is an ongoing topic of discussion in "Muppet Show" episodes, "The Muppets Take Manhattan," and TV interviews." Unfortunately Kermit and Miss Piggy the couple officially ended things in 2015. Considering that they met in 1976, their relationship definitely withstood time.
