Trust was breached as soon as you started believing the "other" person needs to believe cheating is what you say cheating is. Not wanting (or allowing) the "other" person to have sex with whomever they like is cheating them out of their own life's experiences and wishes. You people that think its cheating when your lover (wife , husband,or whoever) goes and has sex with someone other then you are so wrapped up in control issues over "other" people, you have no clue what you are talking about. Trust is faith and faith is much like commitment. But sex is just sex. Being faithful to someone "other" than yourself is trusting the "other" person will always be themselve and not become you. Meaning what they define as cheating will possibly be an opposite of your definition for all eternity.
A dictionary doesn't define you or your definitions. It defines its own definitions much like you will or do for yourself. Otherwise you may as well jump on the train like hitler did to the jews. He defined for them, his own meaning for their existance. Much like sadly many trust in a dictionary instead of their own soul. Thats why "common sense" is not very smart. Your limited to what is common and not the entire knowing.
That's a good point , basically everyone is their own person an no one should have a say in what anyone else does , problems start when agreements have been made and that agreement is broken which is when the lying begins.
ie: Two people agree to remain together in a partnership and not to 'go' with others, then one breaks that agreement and has sex with someone else at a party or whatever .
For instance:
At the beginning of a relationship I would say something like .........
We are still free to be with whoever we choose, whenever we choose, simple.
That way no trust is broken and no one need to start lying to cover up and importantly neither person feels controlled or trapped, if a relationship is going to work with any kind of authenticity , this is the way to do it imho
All I ask is that the other informs if something starts to go on.
I believe that is reasonable.