OK. So quick update...
Thanks for all the responses. I just wanted to clarify a few things.
He's not 'wet' and he does and would have my back. However, he isn't a confrontational person. He's very gentle and kind and not at all aggressive so comments about an "angry man" confronting a woman are irrelevant. Neither have I reacted to anything she's said or done. In fact, until this week, I've been perfectly friendly and normal with her. So I'm not 'feeding' it in any way.
Anyway, we spoke at length about it on Tuesday evening. I told him what she'd said about his kids. He had a few things to say about that. He thinks her motivation is more about power and wanting to get one over on me rather than fancying him. I'm inclined to agree.
Anyway, we all went out last night for our weekly activity meet up and it was interesting...
He handled it perfectly. He ignored all of her efforts to catch his attention from gazing at him with "starry eyes" almost constantly; to trying (and failing) to insert herself into a chat he was having with someone else; to throwing her head back in laughter to a really lame joke he made that the rest of us eye rolled at; to (no word of a lie) dashing across the room to pick something up he had dropped and hand it back to him that he was more than capable of picking up himself. He just ignored all of it - said "thank you" for the thing she picked up for him out of politeness but didn't engage any further. It was weird and really obvious!
She made an acerbic comment to me out of his earshot - it wasn't so much what she said but the way she said it. It was the only thing she said to me all night.
And then.
I'd forgotten this but she doesn't know I'm going on the weekend away. It was something they had all booked but got cancelled for lockdown. I was invited but couldn't make the original date. I only decided a few weeks ago that I was going after my boyfriend persuaded me to. And it just hasn't been mentioned.
Last night, she was having a conversation with 2 other women about it. I was out of earshot so, although I could hear their voices, I couldn't hear what was being said specifically until she referred to a cute/sexy outfit she was going to take with her. She mentioned it 3 or 4 times and it felt really forced by the end. She was the only one speaking loudly enough for me to hear so I didn't hear the responses and after that, she went back to speaking at a volume I couldn't hear. He wasn't in the room at the time so it wasn't for his benefit.
It felt very much that she was saying it for my benefit to, as my boyfriend has said previously, unsettle me and make me feel insecure as she thinks he'll be spending the weekend in her (and her cute/sexy outfit's) company and away from me. It did neither of those things. But it very much felt like a 'gloves are off' moment and I suspect she is going to escalate now...
When we left, he just said to me in front of everyone, "Right, come on let's go," said a general goodbye to everyone and, whilst everyone else said bye, she stood there and just said, "Oh. OK then," in a surprised tone, which is a weird response to someone saying they were leaving at the end of an evening when others had already left...
We didn't talk about it after we left so he doesn't know about the acerbic comment or the outfit bit but I feel I want to tell him just so he's in the loop and because I want to tell him he handled it well.
As I said before, I'm autistic. So, whilst I find her behaviour irritating, I'm also fascinated by it!
I'm not wrong about this, am I? She really doesn't like me, does she..? And she's not a friend to him any more than she is to me.