一目惚れなの。

It was love at first sight.

まさか惚れたんですか。認めん、認めんぞ。あの男を義弟になるなんて、僕は絶対いやです！

You haven't fallen in love, have you!? I won't have it! Having that man become my brother-in-law; I absolutely hate that!

ビルはどうもメアリーに惚れているらしい。

Bill seems to be stuck on Mary.

彼女は一目で彼に惚れ込んだ。

She fell in love with him at first sight.

誰でも大なり小なり自惚れはある。

Everyone is more or less conceited.

彼女が彼に惚れてるのは岡目八目疑いのないところだよ。

As a disinterested third-party, I can declare that she secretly loves him.