Originally Posted by MonoVCPHG
I'm not thinking of your friends relationship specifically however if the woman who he bought the house with went off the deep end she would have the capacity to affect his life across a broader spectrum than a person with a solely emotional entanglement. Therefore it is in his best interest to foster that relationship with greater emphasis.
If I was fostering a relationship for reasons such as protecting myself from the damage my partner can do (even in part) I would seriously be reconsidering whether or not that's a relationship I should be in. I generally assume that my partners want to be with me and cherish the connection we have. My choices are going to be based on those things and not on worst case scenarios.