What does it mean when a guy tells you a secret?

This guy basically asked me if I can trust him with a secret and I was like of course and he started talking pretty deeply about how he likes this girl (I know the girl) and how he gets so nervous around her and stuff...but the thing is, I've NEVER seen this guy be so deep! Why did he decide to spill this to me?
What does it mean when a guy tells you a secret?
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