Why do I spend so much analyzing what my ex does?

I analyze what my ex does. Why he looks at me, is jealous etc. I google about it, ask friends etc. But I know he’s not the one. And he’s the one that broke up with me (because he lost feelings) I notice that I’m much happier the more time I spend away from him. (We don’t talk anymore but we go to the same school). But I feel myself often searching for answers and it doesn’t make sense :/ I think deep down I still have some hope. He was my first love. But I have every reason to let him go... so I really don’t understand my behavior

Why do I spend so much analyzing what my ex does?
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