Very, very tricky.
I had a similar situation a few years ago. A neighbour of mine - Penny, from 7 doors away - was also a friend, and we would go on coffee mornings with several other female neighbours and mothers once a month or so.
One January, we all met up for a night at the pub to celebrate someone's 40th birthday (about 20 people who knew each other in the neighbourhood,) and we all got quite drunk.
I went outside for a bit of fresh air, and Penny's husband Mark, came out about a minute later. Within several minutes, he started groping me and making comments about my boobs, my legs, and how 'hot' I was. I was so embarrassed and mortified, and questioned if I had lead him on. (I hadn't, but as every woman knows, you question yourself, when you have a man try it on, or sexually harass you.)
I managed to get away from him, and felt very shaken and upset, and went home soon after.
I toyed with whether to tell my friend Penny or not, and after much soul searching, I decided I would. (And I did 2 days later.)
She was gobsmacked and said 'he would never do that!' When she asked him about it. He said I had tried it on with him, and when he 'rejected' me, I left the party, and decided to lie about it to cover my own back! She called me a lying cow and said I was a nasty trouble maker, and I was trying to split them up.
Within HOURS, she had slagged me off to anyone who would listen, and they believed her (and him!) and I was the desperate slag who had tried it on with her husband. The only one who believed me (luckily) was my husband.
Life became so awful in the neighbourhood that we had to move. We put our house on the market 6 months later, and moved 10 miles away.
Fast forward a year, I bumped into an old neighbour who had snubbed me and turned against me, and she said 'oh Lisa, I am glad I saw you, I am SO sorry about being awful last year.... turns out Mark WAS a lecherous twat. He tried it on with Penny's SISTER in law (her brother's wife,) a few months after you left, and it was caught on cctv. Penny has been trying to find out where you are to talk to you about it and say she is sorry.'
The damage was done then though. So I said 'sorry, but that ship has sailed. I had to move HOUSE because of all that, and my life was made a living hell by Penny and Mark and their cronies who they got onside. So no. I am not interested.' And I walked off.
Never looked back.
But yeah, that was a tough time. HE was the lecherous cunt, and I was the one disbelieved, and the one who had to move house.
Penny left Mark, and I hope he rots in hell.
So yeah, good luck with all this @AnnabethChase I don't know what to suggest. Whatever you do, it will be 'wrong.'
I have not used any real names.