he keeps his promise
彼は約束を守る人間だから、頼りにして大丈夫だよ。
He’s a man of his word, so you can count on him.
何かがあって彼は約束を守る事が出来なかった。
Something came up, and he couldn't keep his promise.
彼は約束を守る人だ。
He is a man of his word.
彼は約束を守る人なので彼が君に借りているものは必ず返すだろう。
He's a man of his word, so he'll definitely return whatever he owes you.
彼は約束を守る。
He keeps his promises.
彼は約束を守る男だ。
彼は約束を守る人だから、手伝うと言ったらそうするだろう。
He's a man of his word, so if he says he'll help, he will.