What is he thinking?

SO this guy I really like and knows i like him told me he didn't want a girlfriend right now. I'm very confused with this because he's been very flirty to me and I've seen him interact with other people (women) and he never blushes. But he blushes when I talk to him? Is he scared? Is he just unsure? I really thought he liked me and I feel very let down. Why would he tell me this?
What is he thinking?
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