Oh, sorry, I had not realized you got back together with your ex wife. So, you went back to the familiar but that still doesn't help you when it comes to your own lack of self value. You are not existing for self in this relationship, just fitting into someone else's life needs.

Have you talked about this with your therapist?

Often it's easier to fall back into an old pattern because there can at least be comfort in that it's predictable. Human beings like it when it's predictible, it serves to reduce stress and it requires less in terms of having to exert as much in terms of constantly facing challenges and problem solving constantly.