Is it okay to tell your friend that you feel neglected by them?

Whether it is a real life or online friend?

And when I say neglected, I mean, like, if they barely responds to you anymore, treats you as if you were invisible, etc.
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And is it okay to tell them how you feel about that?

And what should be done to fix this?
Is it okay to tell your friend that you feel neglected by them?
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