I have a friend with whom I have been playing a certain online game for many years. I also play with his wife. I have been friends with both of them for over three decades, first individually, and then as a couple after they got married. They are both very competitive, as am I. We all good-naturedly compete, and the game is a positive part of our relationship.
Recently the husband has started "throwing" the game with me. By that I mean he intentionally makes plays that are strategically foolish, which results in me winning a much larger proportion of the games than I had before. I know his playing patterns, and immediately noticed when he started doing this. At first I thought it was a fluke, or that I was imagining things, but it has continued now for several months, to the point that I am worried about him.
There's one more bit of information. In the last year (before the game thing began), he suddenly announced to the wife that he wanted a divorce. She was shocked and upset, but is a pragmatic person, so she told him that if he didn't want her in their house, she would move out. She immediately made plans to do that (within a few days), but when he saw she was serious about it, he reneged and blamed his request on stress at work. She later told me they had "worked things out".
I'm concerned about my friend, and wonder if he is trying to tell me something with his game behavior. But I don't know whether to ask him about it. I don't want to create a situation with him and his wife, or between myself and either of them. I value both of their friendships and care about both of them. How do I express my concern to my friend in the correct way without creating a weird situation?