Signs of Cheating

I was working out in the gym just now and received a sms from a very close colleague... He's getting married to a girl he has dated for 4 years, good for him. She's a nice girl, a keeper and ideal woman. Which leads me to think about the girls i used to have... and some of my friends have... Good quality girls and players.... and some signs of cheating...

Guys, what are the signs of a woman cheating on you, can you really tell??

The main question is :-

Is there any possibility (low or none) that a woman will cheat on you even though she is being lovey dovey, showing 101% interest?

Chicks are good at lying, so yes, very possible.