Can my boyfriend have me arrested for using his checking account without his authorization to pay a credit card if I already paid him back all the money and this happened 5 months ago?

Answer 1

No, he cannot. Although you probably should not have used his account without his prior approval, you have removed one element of a possible criminal offense by paying him back thereby demonstrating that you had NO CRIMINAL INTENT. He cannot now use that to hang over your head. [I hope that you kept the proof that you repaid the money!]