My friend is having an affair with a married man.

Recently I learned that one friend (F28) has been dating a married man for well over a year. This surprised and shocked me. When I first met her she came across as a person with clear morals and strong values, she also had a deep connection with her spiritual side. Being a Christian, she used to talk about her faith passionately and constantly said that those principles were above everything else. She also seem to be a kind and caring person. When we started to spend more time together I did start to notice some things like the fact that she always was extremely secretive about her past relationships. In various occasions she said that she didn't trust men and that she never imagined herself getting married. She always avoided commitment and I assumed it was due to her high standards regarding religion and its morals.

So imagine my shock when she tells me that she has been in a relationship with a married man. She says that she knows that there is nothing between them besides the adventure, she does not see herself getting married with him or anything of the sort. Last time she was in a very bad place because he went on a trip with his wife and there are high chances that they are not seeing each other again (she lives in a foreign country and her situation there is not great, so probably should have to return). She told me that this past few days they have been talking a lot about them and that they have come to the realization that they do in fact love each other, although she insists that the relationship won't go further from what they have. She seemed really sad and heartbroken about the possibility of losing what they have and when last talk she said that she no longer cares about anything and that she has been drinking a lot, which again is extremely uncharacteristic.

I don't know what to feel about all this. I do care for her and want to help but feel powerless. I don't understand why she would do something like that. I don't know what good can come out of this. It seems like if she is able to stay in that country she will continue the affair. It seems like it is the only thing that she wants or cares about. I am confused and worried, I feel like this situation could drag her to a very low point.

Where is my friend? I feel like I talked to a different person, one that I don't even know if I respect. This whole thing has made me very sad and I truly fear for her but again, I don't know what I can do...