It didn’t seem that farfetched imo. Totally something that can easily happen given the right conditions.

I think people collect baggage as they grow older. Depends on the individual if they grow from that baggage. I would ask them about the previous relationships and why they failed, and what they learned from them. If the reasons they failed feel like can happen to you, or if they seem to always place the blame on the other person and take no responsibility, then I would think hard about whether this person is the right fit for you.