Juristis
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Well, I'll start by saying that love is not a feeling, but a state of the soul (not the body). Love in itself does not carry negative emotions; it is never selfish. Now, let me explain: if a person loves, they will only wish good things for the object of their affection. If the loving person learns something bad about the person they love, then other feelings come into play, which introduce doubts, anxieties, and so on.
All human feelings are personal perceptions as a result of something or even just like that :)
1. Let's imagine a situation: a girl is madly "in love" with a guy, but he doesn't love her no matter what. Instead of the love I'm talking about, other feelings interfere (jealousy, resentment, anger, a desire to please, etc.). These feelings prevent her from living; she is depressed. What kind of love are we talking about? :) (infatuation)
2. A mother loves her son very much and does everything for him; naturally, she wishes only the best for her child. But if he grows up to be some kind of callous, evil, and insensitive person (violates laws, torments animals, or something else), then the mother begins to fear her offspring. Initially, the mother cannot experience bad feelings, but only love (because love and family are one and the same), but then love disappears, not because the mother no longer wants happiness, but because feelings of fear or something else interfere, and that pure state disappears.
In general, you can be infatuated, but building love is much more difficult.
And now, specifically: Love is not love if it does not receive love in return; unrequited love is just infatuation. Love is a spiritual feeling and cannot happen, for example, with an object that is dear to us (but not spiritual).
Sorry, I completely disagree with you. I'll explain in more detail why.
1. Well, I don't consider love to be any kind of state of the soul. And I don't quite understand what this "state of the soul" is. So, I don't agree with the definition of love.
2. Your first situation. These feelings, such as jealousy, anger, etc., do not prevent love; that's why they say, "Jealousy means love." And I don't even know what infatuation has to do with it; infatuation lasts for a short time, usually from a couple of months to half a year; it is a bright surge, passion, a lot of emotions. You wrote about passion above; passion is part of infatuation.
3. The second situation, a mother who stops loving her child, whom she raised and brought up, seems like a fantasy to me. Maternal love, in my opinion, is the strongest; I don't believe that any fear can overcome it. That's why it is allowed not to testify against one's family; otherwise, there would be a lot of false testimonies.
4. I agree with the first sentence of the last paragraph. I disagree with the rest.
P.S. Are you a romantic? You elevate this feeling so much.