Hi JA customer and thanks for your patience.
Given what you have written it is not possible to answer your question. It is clear that she wishes to keep you in her life as she has introduced you to her children but it is not clear where she is living and moving to and why her intentions to move have you concerned? Are you saying that you live with her even though you are married to another whom you have no intention of divorcing? Is that what you mean?
Would you clarify this for us?