Could a guy change his mind after rejecting you, or is he just being friendly?

katiesailstheseas
I was really into this guy and he seemed interested back then he said it would be better if we were friends, he said he didn't want to lead me on. We hadn't seen each other after that but we would still talk every now and again. I saw him this Friday and he asked me how I was doing, flirted with me, kept touching me (not creepily or inappropriately), and would watch me every time I would go to get water or walk across the room. He also hugged and gave me a high five then hugged me again before he left and told me very seriously to keep in touch.
Could a guy change his mind after rejecting you, or is he just being friendly?
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