Often affairs are far more about how the person makes your spouse feel as opposed to just how they look.
Yes.
I would say to anyone, don't trust the OH blindly. If anything doesn't sit right with you but you think 'he'd never do that', that's when you should watch out for potential red flags.
Some women can be predatory. I've seen them in action. Just because you've been happily married 30, 40 years doesn't mean that they won't be flirted with. The 'men can have female friends' posts on here are from people who haven't a clue.
I know generalising, but the ones to watch are newly single friends and new single colleagues/hobbyists.
Often it won't be predatory but there's the damsel in distress/madonna and child attraction for the man.
Usually the man will be 'safe' (married, a bit of a dad bod, not all that fanciable but nice enough) and the woman will have no intention but will lap up the 'friendship' and he ends up in an emotional affair.
It's unfair but if you are a single woman, you will usually be socialised with a lot less with than a single bloke where coupled up friends are concerned, if you are included it will be on girls' night out or to make up the numbers.
If I sound bitter or nasty, I'm not. But I've seen it with my own eyes, and been through the mill.
One of my friends went through a phase of seeking out dishy men either married or long term relationship. Fortunately, I had become newly single at the time, so she didn't break up mine.
I've watched a male friend 'fall in love' with his wife's best mate not long after she became a single mother. The friend was just a friend but the more she resisted, the bigger the pull. Poor wife had to make a choice, bin the twat, bin the best mate or put up and shut up. The married couple are still married, the best friend is still her best friend.