to fall in love (with); to be in love; to have romantic feelings for someone.
彼女は同僚に恋していることを友達に打ち明けた。
She confessed to her friend that she is in love with a colleague.
若いころに恋した相手のことを今でも覚えている。
I still remember the person I fell in love with when I was young.
恋する気持ちは時に人を変える力を持つ。
Being in love sometimes has the power to change a person.