Role Reversal

I know very little about psychology but noticed something the behavior in a new friend I've makes and I wanted to know if there is any merit to my idea. Just to outline whats happen, I've recently made a new friend who has opened up to me a lot. This friend has talked a lot about a specific relationship that is causing a problem. I've noticed that they dynamics between our relationship as friendship seems to mimic this problematic relationship, however, with the roles reversed. Where she (my friend) is playing the role of the person who is bothering her (her friend) and I'm playing the part of her (my friend). The structure of the situation is very similar and I would like to know if this is normal and what I should do about it. I have little emotional investment in this so I have a good degree of flexibility in my options. Thank to anyone who has an answer to this, really open I've made myself clear.