We're lucky (I know!) to have a holiday cottage… When we're not using it we're happy for family and friends to make use of it and ask for a small contribution really just to cover costs, bills etc… Generally that works fine but we have one friend who borrows it and then takes friends of his own (he always asks)… I know I shouldn't really care, that if they've covered any costs it's up to them really how they use it, but find myself feeling rattled by it… when they invite their friends it feels like it shifts it from them borrowing our cottage to them treating it as their own and I feel a bit invaded or something… I know I could say no but that feels small minded when really makes no difference to me (I’m not there after all!) so I don't but then I'm left feeling like they're not respecting a boundary or something- would anyone else feel the same? AIBU??