Why does he want me all of the sudden?

There's this guy. Everyone kinda noticed he liked me before, but he never did anything about it. Ever since I started not to feel for him that much and ever since I started to go out more without him, he started to be a lot more interested in me. In fact, he started calling me some nicknames that 'sing me off as his property', which is completely wrong since he never said how he felt about me or shown it.

So, what I'm asking is what is he doing?

What is he thinking?
Why does he want me all of the sudden?
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