I don’t particularly blame the other person. I’ve been cheated on and I didn’t feel anything but sorry for the other girl. I didn’t blame her for wanting him and I don’t blame her for not thinking of me. I was a stranger. He was the only one to break a promise to me. If I did consider her in any way responsible for me or my situation I could just as easily say she did me a favour as say she harmed me. But I didn’t consider her in any way responsible for the situation. He wasn’t married and so I had no reason to think I’d be the last person he’d ever sleep with so why should she have thought that? She thought she was the next person and the only reason the order got messed up was that he never told me about her.
On the other hand to seduce someone who is admitting they’re married is horrible. We have marriage for a reason. When people unknowingly sleep with a married person and continue to do it after they find out, or when they believe that person will get a divorce, they are doing something wrong but they aren’t having a good time about it or being malicious so I don’t count those people as evil.
I don’t think there’s any distribution of blame. It’s not like I think a person is only half to blame if they admitted they were married and were seduced by someone actively trying to break up the marriage. I don’t think any of the blame gets shifted over to the other person. The cheater is still 100% to blame, and the seducer is 100% to blame for something else. There’s just extra wrong being done on top of the original wrong. The only way I’d reserve some anger for the other person would be if she intentionally seduced my legally wedded husband from me in order to ruin my marriage and even then it wouldn’t be that I was taking some of the anger away from my husband, I’d just find extra reserves.