You don't. I had my fair share of affairs and long relationships out of wedlock being married.
Rule #1: The second party has to know I'm married, and I won't leave my wife maybe.
Rule #2: Every Holiday I will be in my house with my family.
Rule #3: The sex has to be astounding for me to risk it all.

I've been practically in the street, living out of a suitcase to be with another woman.
Lost it all in two divorces. I'm still paying child support for my youngest son and he's 28.

Not anymore. If I get a divorce this time, there will be no remorse, no pity, no guity feelings, and everything will be done according to the law.
I will get my fair share even if I'm the offending party.