Why does falling in love makes us feel so dreamy and out of reality?

What happens when a person falls in love that makes them more spacey or dream-like? Is it a chemical hormone? Is it the same when we first have a sexual encounter with a person too?

Do some people get high off of this love-quest?

Why does falling in love with someone make us “blind” ?

Why does love make us people do such stupid, wild, irrational things?