我会一直等到你回心转意的那么一天，我要让他知道，因为我是世界上对他最好的男人大哥们帮我翻译一下

i will right here waiting till you return to my side.i will let him know since i'm the best man who loves and takes the best care of her.

I will wait till you change your view, I will let him know, because I'm the man who take the best care of him.

到底是“他”还是“她”？
她：I will be waiting for your return. I want she knows I am the one who is kindest to her.
他：I will be waiting for your return. I want he knows I am the one who is kindest to him.
咋看着你这中文都不利索！一会你一会他的，你要跟谁说着话？等到“你”回心转意，却又是对“他”最好，那谁还会回心转意?

When I can always you change an attitude that one day, I must let her know, because I am in the world to he best man

I will wait until you come back, for I want to make her know I'm the best man for her in the world!