So SO and I had a huge fight because I am sick and tired of my SD5 destroying everything she can get her hands on. I asked him to please do something about this because I can not afford to keep replacing things that she destroys. He told me to do something about it.

I told him that I am not her mother, nor do I have any right to discipline her for things that she does, since she is not my kid. He then proceeded to tell me that every time I tell him that she is not mine, or that I do not have to do anything to help him out when it comes to disciplining her or taking care of her that I am creating resentment and jealousy in our relationship.

WTH! I explained that there was already jealousy and resentment because of his choices, and that since she is not my child, I shouldn't be responsible for what she does.

Most of the books (and many if the posts on this site) explain that I should step back, and let the child's parent deal with issues such as discipline. How can I get my SO to see that I don't have any legal rights to the child, therefore, I have no rights or obligation to deal with the child?

P.S. SO tried to pull the "having a child means you never get a break" crap. We have been TTC for a couple of years. I tried to explain that my own child would be different. He does not seem to get where I am coming from.