Upset that she found out

26F Albanian girl seeing a 41M, he let me take his wife’s g wagon when she was on vaca because he knows I really like it. we both looked through it when it was time to give it back and I got all mt stuff out of it. but apparently she found a lulu headband in it. Which I know is mine but didn’t think I left it. Now he’s blaming it on me that she’s on to him, is this my fault or his?