My wife's friend from college had a crush on her: Is it emotional cheating?

Hi Shalini Ji,Me(M38) and wife(F37) happily married for 12 years and blessed with one daughter. Partner(F28)continuing friendship with a person[M] who had crush on her before marriage considered emotional infidelity? Me(M38) and wife(F37) happily married for 12 years and blessed with one daughter. My wife is having friendship (strictly platonic) with a guy from her 10tlh grade (same class). Before our marriage (she may be doing her college, our relationship just started may be 2 weeks) this guy told her he has genuine interest in her and he want to take the relationship further if she wants, she said she is not interested in a relationship and she got committed, she always saw him as a friend, no other feelings for him and we can be friends if you don't bring any romantic interest again. He never took this talk again ever after and happy to be a friend. They are talking as friends. She got married to me. He also got married. They still do chats once in a month. She introduced me to him and visited his home when we visited his country. He also came to our home once with his family. She used to update me with every chat she had with him and the content they are chatting. I am ok with that When we were talking about our school life and college life 2 years before. She said this guy had crush on her during her college days. I asked her, why did not she tell me this info till now. She said it is not purposely, she does not feel the need to do as the person is not in-appropriate with her and continuing as good friend as promised after she rejected his proposal. I don’t want to create any unnecessary issues as I don’t have any felling or so with him. That time I checked their chats completely, it’s about update about their common friends, their recent travel, their job, meditation courses and the books they read recently. I haven’t seen any flirting or romantic message from either of them. So I am perfectly fine with it and had no problems. I recently came to know about the concept of emotional cheating which is very new to me. Before that cheating to me is only flirting, sexeting and physical sex. I have asked for advice in redddit.com in infedility sub forum about emotional cheating/ emotion affair. There persons are advising like even having friendship with someone who had crush on you is emotional cheating as it is indirectly leading them on you. So with a omission of lie he had crush on her and indirectly leading him on you wife was emotionally cheating on you. This is very much equal to cheating. I do have lots of friends in other gender, but no one had crush on me. Does this count as emotional cheating/affair as she did not mention he had crush on her before marriage? I am little depressed and not able to spend quality time with my wife who is in postpartum depression and take care of our daughter properly as before. Do you guys advise me how to navigate this situation?