Guy is a womanizer?

Every few weeks or month, he starts texting a lot , meeting the girls at bars and having sex with them.
But after a few weeks or a month, the "relationship" fizzles out and suddenly he stops talking to the girls he was texting and sleeping with.

He expects kissing, sexual intimacy after 1st dates itself and if that doesn't happen then he gets annoyed and stops talking to the girl.

How does this happen?
And does a womanizer change? If so will a girl who sleeps with him easily change him or the girl who won't sleep with him?
Guy is a womanizer?
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