

To be as charitable as humanly possible to her, I’d imagine the bit she has a problem with is where you mentioned you’re “not hiding much”, engaging in that conversation rather than shutting it down immediately?
Just to be clear, I’m absolutely not saying you’re in the wrong, or she’s in the right; you clearly didn’t engage in that type of conversation, and I imagine she’s eager to place the blame on you rather than face the fact that her husband is very obviously leching on her sister.
But I would hazard a guess at that being the bit she’s hung up on. Also his messages made my skin crawl, they’re weird as fuck.
Oh no absolutely not, don’t be mad at yourself - you replied in a very normal way, and haven’t done anything wrong – his intentions are colouring the chat.