wtbh, take a couple of deep breadths and relax. ((((hugs))))
Now, there is nothing to be worried about. It's just some text messages. Lexie is right, put this behind you and move on.
And AH told me last night that BIL's records do not show that he sent me anything.
Go no contact. They are quacking. Stop reading his emails, texts and don't answer his calls. You have the choice on whether or not you want to have contact or not. You can't change what they are doing and you can't change what happened but you can let go and let god.
Sending good calming thoughts and prayers your way.