All sitches are unique. Yours is only a very unique due to your cancer.
Just because you "set her free" doesn't mean that DBing principles don't apply. Because they do. And discussing separation is a R talk. And you should not initiate R talks.
If you are still concerned that she is just using you for security.... Then go file for D.
M(53), W(54),D(19) M-23, T-25 Bomb Drop - Dec.23, 2017 Ring and Piecing since March 2018