Do you journal? Sometimes that really helps me parse things out when I am feeling confused. And of course, my therapist is a huge help but I only see her when I see her, so for the in-betweens I need different support.
If you read over on the Alcholics' side of the forum, when people relapse, a huge part of the responses are about looking at one's own recovery plan and figuring out where the holes were. It's no different for us. If moving on from this relationship is still your goal, it's time to double down on what was working and filling the gaps that left you vulnerable.
You're going to be okay.