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I was the non-needy one in our relationship and she ended up having an affair with someone who NEEDED her more than I did. Her biggest complaint in our relationship was that I didn't want to spend more time with her and she left me for someone who did. My non-neediness was the single biggest factor in our relationship ending. Could someone please explain why neediness is such a bad thing because I am not clear on this?
You basically answered your own question. Your girlfriend hanged around you as you where giving the attention she all so needed, but when she found a guy that would give her even more attention she ditch you for him. Needy people always wanting attention as much as possible. Its a drug for them that they can never have enough off. They will only remain loyal to you as long as you are the one showering them with the most amount of attention, but as you experienced if they find someone else that will shower them with even more attention they go to that person.
This is why being needy is bad.