Yeah, it's bad that they'd do something like this behind their partners' back, but a lot of them probably signed up in a moment of weakness and never planned to

Yeah, it's bad that they'd do something like this behind their partners' back, but a lot of them probably signed up in a moment of weakness and never planned to take it further. It's like flirting when your partner isn't around. It's bad (assuming it isn't something you've agreed upon), but if you stop it before it goes to far it's not as bad as going to bed with somebody.