Your Xh is saying and doing everything you want to hear and see and im'e sure he is OW too.
Also, her father is dying and it sounds like he may be a big support for her during this difficult time in her life. This will only make her rely on him and want him more. Since he is divorced she doesn't see him as "offlimits." I personally would run for the hills too and would never be interested in anyone carrying that kind of baggage (who needs the drama?!!!), but there are a lot of needy, dependent people out there. She sounds like she may be that way.
There is no arriving, ever. It is all a continual becoming.