Is this real?

So I’ve been wondering are all boys mean when they are done flirting and hanging out with a girl?

I mean I know some boys believe in planning relationships ahead of time. Like for example planning to be with a girl and then leaving her after a certain time?

I know this is a thing but do they have to end things so mean? I get it they are done but does that give them the excuse to be so abrupt in the end with their decisions in the relationship?