Faye has come in for a little bit of critisism lately and I can't see why.
For 27 years, she assumed her husband was dead and for all that time, she's had no final confirmation of it. When she finds him alive, happy and living with another wife and family, of course she's going to have mixed feelings.
I can't help but think she's a damaged woman and would probably benefit from therapy, though in true soap tradition, her therapy will probably be to try and kill Mark and ruin his life. (I think I'd prefer that)