Yep, we all know someone like this, sadly. They go from gregarious and sociable, with lots of friends and a willingness to meet up, to near hermits who drop their friends and their former interests and whom nobody sees for YEARS in the end. Even their socials are controlled by the partner and become cringeworthy and sad. Every post must mention partner in glowing terms. Every selfie a couple selfie.
I have a 'friend' like this who I haven't seen for four years now because of his horrible controlling cow of a gf. Last time any of us saw him, she policed him like a bleeping jailer. Stone faced. Uninterested. Wouldn't say hello to female friends he tried to introduce her too, just glared and dragged him away. Grasping arm. One mutual friend of mine managed to arrange a meet-up three or so years ago when he was in her town for the dentist. She said it was clear he met up with her (in a pub) without the partner's knowledge. He apparently went white when he realised he'd missed his intended train and would get home later than intended, clearly because it would lead to interrogations as to where he's been and who he'd been with. Clearly any contact with ANY woman not her is forbidden.
People are far more likely to recognise it when it's a male controlling the female partner though. It's seemingly treated as a joke when it's a female controlling the male in an abusive way.
The guy I'm speaking about above has a history of pretty severe family trauma and abuse, and I'm certain it's key in allowing himself to be controlled. All his relationships have been like this to some degree, this current one is just the worst and most long-lasting by far. The previous one had him being pushed into converting into a particular religion she was obsessed with, which he really didn't want to do, but felt pressured into doing. He only got out of it because they were in different countries and he was still socialising with people who encouraged him to stand up for himself. Once you actually live 24/7 with a controlling partner, it's only going to escalate and become very difficult to remove oneself from.