Just that really, I'm not sure if I'm being unreasonable to be unsettled by it.
One woman who is the wife of a not particularly close friend in my friend group makes a beeline for him when we all meet up. She will sit next to him for most of the evening and he will often be engrossed in their conversation, leaning forward, lots of giggling and eye contact, she sometimes whispers in his ear, I hear snatches of intimate conversation, the sort you have when you're bonding. He really laps up the attention, he's quite shy and usually awkward with people and is usually fairly quiet and distant in groups.
They do a sort of negging thing as well where they will jokingly be horrible to each other. One time she laughed at me and said look at her (my) face, she's really pissed off, I was waiting for them to finish their conversation so we could leave, I don't know if I looked pissed off. Her husband doesn't seem bothered.
My partner has a lot of female friends and I feel like in the past his boundaries with them haven't been very good. He made passes at a couple of them, one when he was in a relationship. If he's like that in front of me I wonder what he's like when I'm not there and what would happen if one of these women pursued him.
He says he's not doing anything wrong because he doesn't fancy her and refuses to talk about it saying that I'm being controlling.