Would you please correct my writing and tell me if it makes sense or not?
Thank you 🙏

Once upon a time I was talking with a friend and discussing how silly and unthoughtful it was to be removed and blocked from a close friend after not being in touch with each other for so long claiming that one of them is too busy to talk.

Today I am doing the same thing and removing one of my closest friends because we haven’t been talking or asking about each other for so long. To a degree, I think we became strangers especially after refusing many attempts from my side to stay in touch. I thought we were best friends but I found out that I was mistaken and repeating the same action in a similar situation.

Lesson learned:
Never underestimate people’s feelings.
Never judge someone according to your common sense. Give them the benefit of the doubt because you never know the impact of the situation on them. Some people don't accept fake friendships and there is no harm in that.

Hello, Marie!

Great to see you here again :)

I am sorry that you had that experience with that friend... that kind of realization happens to many of us at some point or another, and it can be really disappointing and painful.

There are a few things you said that I was not totally clear about (see questions below), but overall, what you wrote made sense, especially your main point: "Some people don't accept fake friendships and there is no harm in that." You could also say: "Some people are not interested in fake friendships and there is no harm in that."

More specific edits:

Once upon a time [add a comma here] I was talking with a friend about how silly and unthoughtful it was to be removed and blocked * by * a close friend [removed by ... and blocked by... not from] after not being in touch for * a long time,* due to either one of them being too busy to talk.

~ "Once upon a time" is usually reserved for fictional stories like fairy tales... In this context, I would personally say "A while back" or "A long while back." I also would use the preterit (I talked with a friend rather than I was talking with a friend)... because that conversation is finished, and it is not just setting the general context for a series of actions you are going to describe next.

~ "discussing" is a bit redundant in your original sentence because it means the same as talking. It's fine to keep both in a spoken context, but I would personally remove one of them.

~ so + adjective is usually followed by "that"... "we didn't talk for so long that we lost our sense of connection to each other"... or "I tried so hard to keep that friendship alive that I eventually became exhausted and gave up." If you don't use that particular construction (so... that), then you would just say "very + adjective."

~ If you were talking about this issue of cutting people off in general (i.e. not about a specific situation), I would use the present tense... "I was talking with a friend about how silly and unthoughtful it * is * to remove and block a close friend just because they have not been in touch or are too busy to respond to a message." This covers all scenarios... i.e. anyone acting that way. If you say "how unthoughtful and silly it was" (in the past tense)... that implies you are referring to a very specific situation that happened to you or someone else and is not finished... "how unthoughtful and silly it was of a friend to remove and block me just because I had been too busy to stay in touch... ]

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Today [followed by a comma] I am doing the same thing and removing one of my closest friends because we haven't talked or asked about each other for a very long time. [The English is totally fine and clear, but given what you explain later, I would just make this clear from the start and say "because she keeps ignoring my attempts to connect with her and never responds."

You could also say: I thought we were best friends but after repeatedly reaching out to her and not hearing back from her, I realized that I was mistaken.

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Lessons learned... [Since there are several lessons below... you need to put the word lesson in the plural!]

Never underestimate people's feelings.
~ Question: Do you mean... never underestimate the impact of your actions or non-actions on your friends' feelings? Or did you mean something else? If you speak generally, it is not very clear how it relates to your larger point because not underestimating people's feelings could mean "Don't underestimate the feelings of a friend who is not responding: they could be really upset or angry about something you said or did and not know how to bring that up to you. It might be a good idea to ask them why they are not writing back rather than assume that they don't care about you. Or they could be going through depression or deep grief, and not have the emotional capacity to be in touch with their friends at this time. Their lack of response might have nothing to do with how much they care about you."] In other words, it would help to know more about how "don't underestimate people's feelings" connects with your conclusion ("some people don't accept fake friendships").

Never judge someone according to your common sense.

~ I don't understand what you mean here. Based on my own understanding of common sense (i.e. one's good sense and sound judgment), it seems to always be a good idea to use it in all aspects of life. Do you mean to say... "Never judge someone based on your own experience or how you would react to a situation, without trying to understand their experience and reasons for why they did what they did."]

Give them the benefit of the doubt because you never know the impact of the situation on them.

~ If I understand this sentence, I would say it this way to be clearer: Give them the benefit of the doubt because you never know how they experienced a situation and what motivated them to respond the way they did.

Hoping this is helpful!