How do guys go from talking to you everyday- saying they like you, being there for you- to I dont care?

How do people just fake it? Or just switch it on and off? How to know the difference between something real to this?

it just shocks me to the core- how fast people can change

how do they do that?

How do guys go from talking to you everyday- saying they like you, being there for you- to I dont care?
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