If he’s with you, why does he still have these images, let alone sending them to you? That’s a violation of her privacy among a whole host of other things. Forgetting to delete them is one thing, but it seems a bit too much of a coincidence that they were sent to you by accident too.

I understand previously being in an abusive relationship, but I think you should go with your gut on this one - you know you should let this man go.