I believe it is fear.
Fear of rejection, fear of being vulnerable, maybe even fear of change
What others replied to:
Why do people not go after the ones they truly love & want to be with? Like why don’t they ever tell them how they feel?
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Because they’re afraid of not being loved back
Good question
Fear
May be they are not available.
Because some people don't know how to speak said feelings
Afraid of rejection
Because they could be nervous or mentally unprepared.
Не знаю
multiple reasons I guess
Vulnerability