What are some reasons a guy would suddenly become cold with a girl he is attracted to?

Anonymous
Examples of cold behavior: Ignoring, avoiding eye contact, becoming very serious around the girl, not willing to make conversation or joke around, being passive-aggressive.

Did he want more from the girl but gave up and got upset because she only saw him as a friend?

Does he truly have feelings for her, but is trying to keep himself from getting hurt because the feelings aren't reciprocated?

Did he suddenly decide that she is unattractive to him?

Just throwing out ideas as to why a guy would become cold/negative towards a girl, rather than indifferent. Let me know what you think.
What are some reasons a guy would suddenly become cold with a girl he is attracted to?
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