Having come from a family with divorced parents, I have this to say:
In my opinion, it is very important to find out if the prospective shidduch has another role model for a healthy relationship. If they are close to a mentor, i.e. a rav/maggid shiur/mechaneches etc. to the point where they spend time in the other home and have seen – not just learned about – what a healthy, beautiful relationship looks like, and that’s what they’re striving for, then I would feel much more relaxed.
If, on the other hand, they don’t have that kind of a relationship with anyone then while I wouldn’t say you should reject the idea out of hand, I would suggest having an open discussion about the subject, in addition to checking very carefully into the person’s middos and behavior patterns.