They aren’t appreciated enough.
Their patience has been tested too long.
They’ve experienced too much.
No one seems to be on the same page.
No one seems good enough.
They don’t feel capable.
They can’t find their fairytale romance.
They’ve been hurt too many times before.
There is too much out there to explore.
They have their own priorities.
They don’t feel they need anyone.
They can not make up their mind on what they truly want.