Why so intense after one date?

Turned out it was someone I knew from my past but lost contact with years ago and he looked and sounded different, so I didn’t recognise him. He told me he loves me, after one date, after we’d fallen out years ago, because we were close friends with mutual interest in each other but he’d refused to get intimate with me, when we both became too uncomfortable to continue our friendship. Why was he so intense?

Why so intense after one date?
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