Why my 18 years old childhood love avoid me like he's irritated but stalk me when I ignore him?

My childhood crush is now 18 years old, but when I leave their house, he always passes in front of our house so I can notice him, but when I go home to their house and when I approach him, he avoids me, why is that? His parents want me to live there.

Why my 18 years old childhood love avoid me like he's irritated but stalk me when I ignore him?
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