I’ve never understood the concept of cheating in general. Basically what a person says is that they don’t want their significant other to experience any kind of intimacy or sexual relationships with any other person except for them for the rest of their lives.
I’ve always seen that as kinda unfair.
On the other hand if I’m in a relationship I typically don’t feel the need or desire to have relations with any other person even when the opportunity presents itself.
I have a friend though that is hopelessly in love with his girlfriend but regularly engages in sexual relations with other women. For him, it’s not an emotional activity, it’s just a physical one.
But you’re absolutely right open honest communication is absolutely key.