Logically I don't want anything to do with her but some feelings remain. I need to examine why. She treated me like garbage for a full year and is living with OM...
You're recovering. Right after BD you excuse all the bad treatment and blame yourself for it. Then you come to realize that her bad treatment of you is a reflection of her character flaws, not yours. But the feelings are still there (I think this is where you are now). Then eventually the feelings fade and you're left with an honest, unflinching appraisal of who she has become, and most likely it won't be someone you're interested in. So don't beat yourself up too much trying to sort it all out, it will come with time. It took about 2 years post BD for me.