Man of Honour
Why don't you refute the point instead of using an ad hominem. Why should the OP respect her relationship status if she's made it apparant she doesn't?
Because a person is responsible for their own decisions. In my opinion, anyway. You are, of course, free to disagree.
So one person's decision to do something does not absolve another person of responsibility if they decided to do it too.
Say, for example, I stole a car, drove it around to your house and said "Hey! I stole this car and I'm going joyriding! Hop in! We'll take turns driving this stolen car!" Would you consider that if you decided to do so then you wouldn't be responsible for that choice?