What does it mean when a guy says "thank you" after kissing you?

On our first date he kissed me in the end but I leaned back because it was too soon.

We kept texting a lot after that and had a second date.

He kissed me 3 times at the end of it.

After each time he said "thank you".

I sort of laughed the last time he said that. Hope he wasn't offended.

What does it mean? And is it a normal thing to say?

What does it mean when a guy says "thank you" after kissing you?
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