How to Spot Manipulators in Dating

With so many manipulators and liars out there, how can singles identify the honest, decent people from those who are just playing the part?

[mid]

Hey, had a acquaintance that would lie and manipulate peoples for favors of any kind.
His personality I recall is the exact opposite as what is described in the video I could say he was benevolent, even.
He loved attention from other peoples and would often fish for compliments.
I remember I saw how his dialogue would adapt to each persons he faced like he's wearing a mask.
What he'd say one day was slightly inconsistent with what he'd say the next because he was telling peoples exactly what they want to ear.

[soulfate]

How do you let someone go? I’ve been trying to get over someone for 5 years now but can’t.