I dunno. If you look at two people and they seem to be getting on well together and seem to be good for each other -- well, what more is there to say?
I know of a relationship where a woman decided that she wanted another guy who was happily in a relationship with someone else. And she cold-bloodedly did everything she could do to break up that relationship. Some pretty nasty things to the other woman, who was a pretty nice person. And the aggressor woman married her target and they've been together for 20-odd years and seem pretty happy. Maybe she's got some bad karma coming, but it hasn't arrived yet.
I guess there is one valid question: if the couple you're talking about both behaved badly in the past, how well will they cope when a time of stress arises in their relationship? That is a question; if their relationship has become important for them, maybe they'll value it enough to work hard for it and avoid damaging it; or maybe, they won't be able to.
It all comes down to character, which is I think the heart of your question: do people that treated others this badly have the character for a successful relationship. Well, people can change for th better, but the only real advice I have is:
Stay tuned..
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