"Disgraceful" is not the word I would use: "asshole" maybe, even "bitch"...
@givemersspls I have to disagree here, there is no respectful way to break up a couple in order to score with one of the members; the idea itself require a total disregard of the others feelings and decisions. It also means you consider your target exactly that: a target, to be acquired or even worse, stolen, and not a person with a will, feelings, priorities and projects for the future.
Also, when you think about it, do you actually want someone that could be swayed and would betray their partner should the occasion arise? Would you ever be able to trust them? I don't think so...
I totally agree about rss, though.