My first lodger back in the eighties was a young attractive law student from the Cayman Islands, she’s now a judge. A few years back she sent her equally attractive daughter to stay with me, her mum said I’m sending her to you because you’re the only man I trust with my daughter.
We once in a blue moon we might eat together in the three years she lodged with me, she used to rib me when I didn’t come home at night after a night, out it was like a brother and sister arrangement
I rarely ever sat and ate or drank with her or with her daughter either, it was purely a business /friendship, I’ve managed to stay friends with all my ex lodgers both male and female.
Taking in a lodger was always a business arrangement for me.
If we did watch a film together occasionally,
one of us would be on the sofa and one on the armchair, neither of us really drank anything so no problems there
I think the other woman in this equation should also be more respectful to you as his wife, would she like the same done to her? How would your husband feel if the roles were reversed and you was living in a home with another man and eating together.
Has he told her he’s married? Maybe he hasn’t, or maybe she fancies him he’s oblivious to it all ( does he pick up on cues)
Im not old fashioned but I know a red flag when I see one and this is definitely one
This needs to be nipped in the bud, don’t be shy, you’re not doing anything wrong, you are just protecting you heart. If he starts saying, oh you’re just being paranoid and other phrases like that then beware of any gaslighting. It’s his job to make sure that he puts himself in a situation that makes you secure on your marriage