No. When I’m with a woman, she’s the only one and it’s always been like this. If I start thinking about other women, it means the relationship is on it’s last leg.
I don't like to start a thread like this off with my own two cents as I feel like that influences the direction of the thread and I'd prefer to let it take its own course before weighing in. I usually chime in later or when asked.
So to answer your own question, no, I have never cheated on a partner.