I believe her because I know that she still loves me, even if she's not "in love" with me. I've done everything wrong up to this point, and this is the first thing that really feels right. Telling her I'm concerned for her as a friend, not a jealous husband, then going dark feels right.
I'll consider calling his wife, but I'm going to think long and hard before I do. I'd rather wait and see what happens. At this point it won't hurt anything.
My plan is to wait until the events planned together for later this month until I contact her again. I'll respond if she contacts me, but no more than short, friendly replies. If, by the 19th she's still seeing him and he hasn't told his wife, all bets are off.
As I said, I don't believe he'll ever tell his wife, and I'd rather have mine disappointed and hurt by him than me instigate it.