<human>: Two of my good friends have been having a rough time in their long-term relationship (they are engaged and been together for 7 years). One friend (lets call her Sally) confided in me that she has a serious crush on a coworker and that her fiance does not know about it. The other day she asked me to driver her to meet up with some coworkers when she didnt have a car (her fiance had it at the time). I found out later that it was actually a dinner date with the coworker she has a crush on. I think this is cheating, but others I have talked to disagree. I'm unsure if I should tell her fiance because they are both my friends or if I am just overreacting.

I really feel like my opinions on what cheating is are different than many people, so I also wanted to get some advice on what you guys think cheating is. I did a short google form if you want to contribute.

If you want to see the results as they come in, here is the doc to watch. 

I'll do some cool graphs if I get enough responses if you all are interested too. Thanks! This will really help ease my mind.

Summarize the given text in a few sentences.
<bot>: Friend went on dinner date with crush, not sure if I should tell her fiance. Also, looking for more info on what most people think "cheating" is.