How would a guy act if he thought I wasn't interested in him?

Anonymous
There's this guy I like and he likes me back, but he thinks I'm not 100% into him, and he's acting really weird and distant. What are things I should look out to know for sure if he thinks I'm not into him? And why do guys act like this? Why can't they be straight forward?
How would a guy act if he thought I wasn't interested in him?
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