Why is moving on viewed as "selfish" when you've been rejected?

Just can apply to ANY situation regarding rejection but especially relationships is what I really want to talk more about?

It really annoys me that being rejected by an ex that you want to love or a crush or anyone that you have strong feelings for clearly doesn't feel the same way about you but insist that you move on while offering friendship like they really expect you to to be okay with being rejected and pretend as if nothing has ever happened especially after a past sexual history between the two of you and get mad and call you selfish and Petty for refusing to accept their friendship offer well they go out and date other people who they really want knowing that you have feelings for them which I believe in my opinion is very narcissistic and selfish.


Another example that I have is two people who have both once and needs such as marriage and children and if one person wants those things and the other person doesn't and the person that once those things decides to move on and find someone that does, then that person is often gasoline and ridiculed for doing what's best for them.

I thought that if a person that you want does not want you although they're not obligated to like you back, you are also not obligated to stick around and be friends either knowing that's not what you want. I have even heard some people on this site condemning those who turned down friendship by calling them "entitled" I don't understand who people think that they are it's the narcissism and entitlement for me that people think that they can treat you however they want and you should be okay with it and act like nothing has ever happened.
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You are so annoyed yet you still took the time and energy to post on someone's question whom you are so "annoyed" by🤣🤣🤣🤣🤣
Why is moving on viewed as "selfish" when you've been rejected?
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