"Keep on loving me" might be the similar meaning. 「いてくれ」means "stay ~" or "keep on ~ing". For example: Stay cool! クールでいてね！ Keep on singing until I fall asleep. 私が眠るまで歌っていてね。

You say "love me again"「もう一度、ボクを愛してくれ」when you realiseｄ that your girlfriend didn't love you any more. I hope you will love me forever「ボクをずっと好きでいてくれ」