If they're "too" dysfunctional, then it is time to wish them well and move on!
Which that is what I've done with X husband and now X boyfriend. I feel sad because I know he's hurt over this. But at the same time he literally can't grasp why I would be upset at some of the most insensitive, harsh, demanding, and self absorbed comments he would make to me! You know some of the stuff he would say to me was so off the wall, I had to laugh!