Our (37M) wife’s (34F) cousin (29F) tried to kiss me personally and now my wife is spiraling. Help me.

Sorry just for how long this is, tl; dr at the bottom. As the title says, my wife’s sister produced a pass at myself at a recent family gathering and I have no idea what to do. Intended for context, I think my wife “Jenna” is absolutely gorgeous but she gets some really negative body image issues. This is in large part due to her sister “Mary” who may be very conventionally attractive, in contrast to Jenna’s more unconventional but (imo) striking beauty. Mary was a successful model until a couple years ago and now works in the fashion industry. In our early days of dating while i would tell Jenna she’s beautiful, she would always say “just wait until you observe my sister”. When I do finally meet her loved ones, she would randomly press me personally for weeks to talk about her sister, whether I thought the lady was more attractive than the girl, etc . I always told her the truth, that I think Mary is attractive in a boring way, and that I think my wife is much more wonderful and interesting to look at. The girl wouldn’t let it go until I actually confronted her about how uncomfortable it made me plus asked her what was going on. This is when she told me that will she always had a chip on her shoulder about her looks because of being in contrast to her sister growing up. These people fell into the classic “smart one/pretty one” dynamic their own whole lives. She also said Mary had a habit of being flirty with all associated with her exes, and cautioned me that it would happen in my experience eventually. She then began sobbing and begging me personally to not cheat on her with her sister, to which We forcefully said I would never cheat on her with anyone, let alone her sister. I’ve been crazy about my wife given that day 1 and there is literally no woman on the planet who could come close to her.

I honestly did not believe her about the flirting at first, I assumed it was just an extension of the girl insecurity, but I was wrong. Whenever we get together with my wife’s family, Mary often finds ways to touch me personally and make little innuendos/comments about me or my figure. It’s super uncomfortable for everyone, especially my wife, and I have called her out on it before. She’ll cool this for a while but eventually begin doing it again. It’s already been six years of this, and every time it happens my wife is upset for days and I have to do a lot of reassuring.

On to the current problem. A few days back we were at my MIL’s birthday party, and Mary asked me personally to help her grab a few things from the garage. As soon as we walked into the garage, she turned and pressed me up against the door along with her whole body and began trying to kiss me. We immediately pushed her away and asked her what the fuck she was doing. She started giggling plus saying she was simply “doing what we both have already been thinking” and kept insisting “you know you want to”. I told her she had been out of her mind and ran out of there. I went straight to my wife plus told her we were leaving. The whole ride home she had been asking me what was wrong, I wasn’t sure whether or not to tell her because I knew how much it was likely to hurt but I also believed Mary would probably try to spin and rewrite it as me making a move on her so I knew I had to just say it. I told her everything and he or she cried the whole way home.

For the last several days Jane has been calling and text messaging my wife doing exactly what I believed she would do, even telling my wife that I said she (Mary) was “the most popular girl I’ve ever seen”, which I had to assure my wife a million times that I did not and would never say although she believes my accounts of the situation. She’s been a complete wreck the last various days, she’s hardly consuming, she pulls away from the touch when I try to embrace her or just hold the girl hand, she says she gets “hideous” and “disgusting” and I don’t know what to do. This is actually the lowest I have ever seen her, and it hurts to find out how much she’s hurting. There are no idea what to do to help her heal from this. Reddit, what should I do?

Tl; doctor: My wife’s sister tried to kiss me, and this is usually triggering deep-set body image insecurities for my wife. How do I help her?