Okay, so the mother wants to become a lesbian again. Tell your son this. If he loves you, he'll support you if you take him with you (or at least be there for him whenever you call, and also where you can always come and see your mother). But to leave completely without a word, without ever contacting him, as if her son never existed in her life (or she never loved him), and yet she communicated so easily with the MC's "best friend" as if the MC didn't exist. It feels like "best friend" became closer to her than her son after they found out about each other (that they're gay), completely forgetting about her son. Ugh, I couldn't stand the way the author would have presented that meeting. I'm sure the main character would have seen his happy mother with his beloved, not caring that the MC was out of place there. I also can't understand how an 18-year-old guy could provoke (persuade?) an adult (who is a psychiatrist) to leave his son for the sake of trying to renew a past love... after all, there is a not so difficult way out of the situation, "You are breaking up with your husband (for a certain reason)", you tell your son the whole truth, and the son either accepts it (and stays with you), or rejects it and you leave alone... in short, complete nonsense.