In any relationship I have ever heard about or been involved in, the issues are never solely related to one person. Stop pretending not to know what you know about yourself. This is not a rehearsal. It is an invitation to break free from dysfunction.
Chemical attraction may keep you where you do not feel right. May be its toxic or harmful in sexual ways or, arousing in ways that nurture fear. Some emotional tie may cause you to feel stuck where you are. Regardless of why you feel connected to someone who is not good for you, this invites to realize the ego speaks first and loudest.
The false you is any thinking and rationalisation that gets in the way. Get out of your own way. Going back to what you do not like feels oddly comfortable because you have done it for so long. Your part in your life keeps you where you are. You are not forced to take refuge in your weakenesses. Step away. Separate from what does not matter.
Whenever you choose to separate from a person, it is a statement about why you choose to become a better person. You can break through karma. You are touched by miracles that empower you to grow from where you have been and whomever you have known. How you choose to decipher pain enables you to rise to new levels of self-understanding.