What does it mean when a guy buys you a Tiffany and Co. necklace after your birthday?

1. We barely talk.

2. We barely see each other.

3. He knows that I've a boyfriend.

4. He treats me too nice.

5. We are just friends.

6. He's single

7. He sets our photo (class outing) as his phone wallpaper.

I really wonder what's his motive...
What does it mean when a guy buys you a Tiffany and Co. necklace after your birthday?
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