What is the best thing to do in this situation?

I just found out about this 5 minutes ago.

My fiancé has a best friend who is gay. This friend is planning on being his best man at our wedding as well. My fiancé‘s parents have known this person for at least ten years and they like him a lot, however, they were not aware that he was gay until yesterday. My fiancé told them over dinner, and while his mother was surprised but okay with it, his father was not. From what I know, there was a lot of yelling, and my fiancé‘s father told him that he was disappointed in both his children now that he knew he had failed in raising them with good values (my future sister-in-law had a baby 14 years ago when she was in high school).

The problem right now is that this morning my fiancé‘s father left their house, called his wife at work about 5 hours later and told her that he was leaving them. He said he was driving out to California (not exactly sure where), and that Christmas was definitely over for him. He also has a previous history of severe depression that he takes medicine for, but he didn’t take any of his prescriptions with him.

Right now I’m several states away from their family for the next two weeks, so I can’t do much about the situation except calming down my guilt-ridden fiancé. He’s worried out of his mind, and every time he’s tried calling his father’s cell phone, his father hangs up on him.

Is there anything I can suggest to him about how to handle the situation?