I may be misunderstanding you; this is a fairly brief post. Is your full question something like,
“So, given that you believe she would not mind being cheated on, would you find it perfectly acceptable to entice her SO to cheat?”
If so, then yes (assuming I were single). If it wouldn’t bother her, then I’d have no problem with it, even though it’d bother me to be cheated on myself: my goal is to respect her desires, not to pretend that she and I have identical desires.
However, if your full question is something like,
“So, given the fact that she would not mind enticing someone else to cheat (but would mind being cheated on), would you find it perfectly acceptable to entice her SO to cheat?”
If so, then no, I would not find that acceptable. The Golden Rule, as I interpret it, requires me to behave unto others as I would have them behave unto me, not as I expect them to behave unto me. And that, again, means respecting her desires, even if she would not respect mine.
That said, there are limits on this. If someone cancels dates with me more often than I find reasonable, then I’ll stop making dates with them. If I find out they’re lying to me about why they’re cancelling dates, then I’ll stop making dates a lot sooner.
I play role-playing games, for example. Some players I know will show up every single session, almost fanatically. Other players I know will cancel if they’re feeling tired from work, and will sometimes even forget to call me to cancel.
The players in the first group will find that I spend a lot more time coming up with interesting subplots for their characters, will give them a lot more time in the spotlight. The players in the second group will find that their characters are never integral to the night’s story, and are unlikely to get invited back to the next game I run.
Even if they desire to be part of the group, they’ve made it clear that they’re not going ot respect my desires to have a coherent group; the Golden Rule doesn’t require me to martyr my own desires to theirs.
Daniel