Fathers behaviour

Hi I am from Pune Maharashtra. I am doing job in one company. My parents (Mom and dad) stay in town which is around 400 km from Pune. So I visit them once in a month on any of the weekends. I have elder sister who is married. I am very close to my mother than my father from childhood. Last time when i visited my parents, my father told me he wants to discuss something personal with me. So that evening when mom went out, we sat in bedroom for discussion. After some general topics, he started telling me about mom and her affair when i was in school/college. This was something unexpected and strange for me and he told he never shared with anyone. But after listening few lines, I asked him to stop and left the room. I was unable to understand how to react as it was totally unexpected thing for me. How should i handle this situation? Should I listen dad completely or ignore and stop the topic. Please advise.

 

Thanks for replying. During our discussion dad told that he saw mom recently talking to that person somewhere in town, and i think it made him to start thinking on it again. During our short discussion what he told me is as below:
1. The person he was referring is my uncles friend. He got introduced to our family because of my uncle. After uncle got transferred to other town also, because of job, he was very good with our family, as i know
2. He used to come at home frequently when nobody was there at our home and that time dad came to know about it. Once for continuous three days he visited home in morning and he was there at home for 1-2 hrs and our neighbors also surprised with it. That time there was some fight between mom and dad which I didnt know. It happened when i was in college, as per dad
3. Also sometimes mom used to tell at home that she is going to family friends home. This is true as i used to go with her sometimes. But as per dad, sometimes till late evening she did not use to return home, and she was seen with that person talking somewhere. She used to go alone that time.
After listening these 2-3 points i asked dad to stop as i was not in a position to listen further and left from there. I dont think there was intention to get closer to me. But as per him he has seen them recently somewhere just talking and think it made him to share it. Dont understand if it is his guesses. I did not discuss it further. Should i do it and will i get that courage to listen everything?

 

To tell you about my family, its very traditional and from small town. may be 20 years before ladies in our faqmily were not allowed to go out except for some function.
After I started going to school, mom started to go out to drop me in school. Apart from that she used to go to that family friends house mostly on sunday evening and sometimes on weekdays in evening.
And after my admission to graduation she started traveling to Mumbai. that was after 2000. But overall she is simple, traditional lady (after and before marriage) and well respected in family. Her family (moms brother) is also very simple and from small village.
Whatever dad is refering to is somewhere in late 90s i.e.after 1998. Being in such traditional family and small village, I wonder if she can think of doing such things.
And as its small town, if you do small thing it will come to know to many people.
Thats why i was not in a position to listen it and stopped him there itself.

 

Looking at our family traditions and my moms behavior and value is family i thought its dad misunderstanding and need to be cleared somehow.