I went into my housemate’s room, looked into one of his closed drawers, found his debit card and used it. Within the hour, I found my own debit card, made him a note, put his card and the same amount of money on the kitchen counter, where he found it. The next day he sent me a text saying, what I did was a criminal offence and he wants me to start paying double the rent. I talked to him and apologized, and he agreed to keep the rent the normal price. Just now 2 weeks later, he’s now saying he wants double the rent again because I didn’t clean the bathroom well enough. How much trouble am I in? Is he allowed to change the rent like that? What should I do?