Why do I feel like this?

so last night a guy i know admitted to fantasizing about me and getting a boner. I asked him what he thought and he was very hesitant about it. He finally caved and told me. Anyways I felt my cheeks heat up, and my stomach kinda hurt. Now the day after whenever i think about it my stomach hurts. I dont know if i should be disgusted or what. The guy IS kinda cute tho.
Why do I feel like this?
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