Why would a guy act so immature after being turned down for sex?

has anyone heard a guy act immature after being turned down for sex? Immature as in ignoring the girls texts for several days or not telling her that he was ignoring her or was mad because she turned him down, even if he does eventually respond to her texts he acts all mad expecting her to know why he is mad and just ends up telling her it doesn't matter anymore. why wouldn't he just come out and tell her instead of being so difficult?
Why would a guy act so immature after being turned down for sex?
Post Opinion