Why do some people fall in love so fast?

He falls in love fast and easy. He has had several exes and has kids by two of them and engaged twice. I’ve only been with him for a week and he’s already telling me he loves me and already calling me his wife. I still barely know who he is.
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He also been trusting me a lot and letting me use his phone.
Why do some people fall in love so fast?
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