Would you end a friendship because your married friend keeps having affairs?

I have a girlfriend who has been in an unhappy marriage for 27 years and has had numerous affairs in probably 20 out of those years, which I've heard about over the past 11 years. I've tried everything from ignoring it and minding my own business to recommending counseling, separation, listening. Even though we've been very good friends, I just snapped out of anger the other day, telling her to get off her rollercoaster ride of claiming she's in love with a boyfriend, while remaining married to her husband. I think my anger shocked her so much that she backed off and has since promised me that she will get counseling and start taking steps to either separate or divorce. But now, I view her such distain that I can barely make eye contact with her. Do you think that my feelings now make me a bad friend? And, what would you do...how would you feel?