What makes a man do this?

What makes a guy who is interesting in you for sure go weeks. Months. And sometimes years without speaking to you? But when he calls or come over to your house it is if nothings changed.
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He might have a sick mother or relatives who needs him he might be busy upgrading his business and being an awesome father to his children or he might think of you as a great friend. Your a mess 😂
What makes a man do this?
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