Even if you don't stay with here, you'll be left dealing with the emotional wreckage of the experience and AlAnon can help you sift through that ****, find the nuggets of precious wisdom to be gleaned from it, and let go of the rest without feeling bad about it.
They have a 12-step program of their own as well, which is pretty amazing for personal discovery and growth. It is great for thinking through personal boundaries and how to set them and stick to them. All good tools for future relationships. Anyway, might be worth checking out the meetings in your local area and then judging if they're helpful or not.
Take care. I hope you're finding clarity and some peace over your decision.
BB