What does it mean when he flat out says I'm into you?

inlovewithyou
Okay you guys I ran into an old school mate Monday night on the mcc bus. And we chatted the whole ride up to the mountains. he gave me his number and asked for mine but I didn't give him my number until the next day when I called and left him a message. And he flat out tells me I'm into you what is that suppose to mean. He also tells me to call him whenever I want.
What does it mean when he flat out says I'm into you?
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