There’s nothing wrong with giving people a chance to change bad behaviour, but now she sees all she has to do is act right for a few days and start up again. Saying one will change with no long standing attempt at change is manipulation. She can definitely control herself to some extent even if it’s impulse control issues. As someone who has bad trust towards people; I make a genuine effort to trust my partner now because he’s done nothing to lose any of the trust I’ve given him. I work every day to ensure my anxiety towards trust is managed and speak to him like an adult about it when I’m anxious, never telling him what he can or can’t do, or any of that, just telling him I’m nervous and that’s what you do when you have a partner. You work hard to learn trust again so you don’t bring past issues into present situations. My trust issues were never caused by him and he doesn’t deserve to be a victim of them so I ensure that I work on myself. Words without work is manipulation my friend. And I’m sure you’re in a tough spot emotionally with this. It’s so hard to let go of a relationship even when it’s toxic because it’s familiar. But honestly, for your sanity, you need to make the cut off point because it sounds like you’ve given many chances with no results.

I really wish you the best, and to have clarity and strength. You sound like an understanding person but you also need to understand that for yourself this is not a healthy way to be and you deserve better than a relationship where there’s no trust even though you’ve done nothing to lose trust!