He literally didn’t want to marry him? What you on about
He quite literally said he’d rather continue being a slave than marry Lister? I think you need to do some rereading honey
He said he didn't want to but then all of his actions showed he was fine with it. Your actions are what matter, not your words. He did not do anything to prevent it from happening.
He didn't even tell the people he could have told he didn't want it, he just said it to himself and did nothing.
This is what you do when you're willing to do something and just a little bit unhappy with it. Like if you're assigned a task at work you don't really want to do You tell yourself oh my god I don't want to do this and do nothing else.
I do not understand why the MC was willing to marry lister.
I guess I've never been a slave so I can't fully relate but I would never condemn myself to a life of beatings and rape by some worm of a man... I especially wouldn't if someone was right there trying to give me an out.