I have too much clutter and a cat that likes his space (though his space is usually about 5 feet from me)
when we first moved into this apartment he was extremely unhappy.
He still is kindof "pissed" off because he keeps marking territory I think. :/
But I bought some product called Feliway and it helped for a while, but I ran out without realizing it and literally next day he peed in my goddamn blanket.