In all seriousness people have similar qualities but every person is different. Assumptions and opinions are never factual and there's no doubt in my mind that you know your wife better than any of us do. If I were you I would have a heart to heart with the Mrs. about how your feeling. Listen, cheating doesn't happen on accident and for one my girlfriend simply tells men she's not interested. Your wife is the issue. She's giving the personal trainer hope. There's a reason why 50 percent of marriages fail. I know I sound logical but I'm actually a hot head I would follow him home and find out where he lives etc. Meanwhile smiling when I see him. That way you know where he lives just in case. Its not hard to "get" someone you just need to cover your tracks. Don't get mad..there's no point but I do find that some people just don't understand that there are consequences for their actions. It can be a life altering experience my friend