We are married over 10 years with kids and we love each other very much. We are in USA. Before marriage she had a boyfriend in Nepal. After marriage, she had even told me about him and said everything was over. I was okay with it. Recently I found out that they are still in touch with each other for the past 2+ years. He is still in Nepal married with kids. They talk at least once or twice a week. I never had a clue and I am sure his wife also don't have a clue. My wife says they are just friends, and she only loves me.

Is it called having an affair? They are not physical but I am sure they still love each other. Why and what would they be talking about?