If you think about it technically, it may be a whole lot better to actually be wanted.
If you're needed it may seem like it's for a purpose: money, company, housekeeping, intimacy, etc. Once those needs can be fulfilled elsewhere - a promotion / increase / better job, new friends, an affair.
Once that 'Elsewhere' has been found, you may not be 'needed' anymore.
On the contrary, If your partner is aware of the fact that he doesn't "need" you for any of those and yet CHOOSES to be with you because he WANTS you, that makes a world of difference.
It might be endearing to hear that someone 'needs' you. But remember, most needs can be filled in more than one way - unless you're keeping him / her alive, chances are he / she won't need you forever. Rather be wanted. At least you know it's for who you are and not what you can do.
How do you see it?
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