What does it mean when a guy says you are hard to read?

theresa71
met a great guy online and we had a strong connection and we got together and had a good time, but he kept telling me I was hard to read. How do we let you know we like you without being to aggressive. Do guys like aggressive? Do guys get offended when girls are really nervous around them?
What does it mean when a guy says you are hard to read?
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