Being the reliable one in a family sounds like a compliment until you realize it mostly means you are the one left at home watching the dog while everyone else boards a flight together. The house sitter role comes with zero perks, zero invitations, and a very clear message about where you rank in the vacation planning conversation.
Being repeatedly excluded from family trips while being handed a set of house keys and a list of pet feeding instructions is a pattern, not a coincidence. Patterns like that accumulate quietly for years until the person on the receiving end decides they have been patient enough and starts making their own plans. And sometimes those plans happen to involve the exact destination that the person doing the excluding has described as a lifelong dream, which is either a remarkable coincidence or a very deliberate choice, and nobody is pretending it was a coincidence.