Sara I do agree with you that it may not actually be an affair and that it could actually be anything - but there are far too many signs to discount and not think about objectively:

- she moves out and needs space
- partying with new friends
- partying with new friends and planning to take trips out of town with them and although she doesn't want her husband around during that time, she doesn't mind asking him to pay for the trip because she knows that he'll do anything in hopes of keeping her, she senses this and uses it to her advantage
- the fact that she told him that if he finds someone that she doesn't want him bringing that someone back to the family home, if he hasn't brought up her having an affair or seeing anyone, why would she bother mentioning that and also the fact of not bringing someone else into the family home (perhaps the reason for her moving out?)
- the radically new, mean behavior, the demands for him to do things for her and being cold & cruel about it
- the MLC and her wanting to find her self and experience new feelings because she has experienced strong feelings of her own mortality and knows that she won't live forever
- there are so many other signs that point to this behavior

Believe me, I don't want this to be an affair but all of the signs point otherwise. Even if she isn't in the middle of an affair right now, she is starting one or on the cusp of that action, she seems to be "fishing"

- This isn't male or female behavior but it is a human behavior to be sure and the view point that I offer is only my own plus all the personal research I've done on this topic and although I'm better for having all this info now at my disposal, I hate knowing any of this because it appears to be common & increasing behavior