Relationships are fluid. So anything said 6 months ago may or may not apply today. It doesn't mean the person lied or that they didn't mean what they said, it just means it is different.

Regardless of who said what when. Don't fight about it, acknowledge that one person heard one thing and the other person remembers saying another thing and make now the spot to start from.

Don't worry about the past, worry about the now.

Don't sweat the small stuff. Unless it wasn't up there with "I am pretty sure I said that I didn't want you sleeping with another person" then what was said and what was promised isn't a big deal.

That said, I rarely understand your posts and what you are asking so I may not have answered accordingly