It means a lot to me that you came to my place. 你能来我这儿对我很重要。

　　I don't know what to say. That means a lot to me. 真不知道该说些什么，这对我很重要。

　　That means nothing to me. 这对我没有意义。

　　It doesn't mean anything to me. I don't care. 这对我一点意义都没有，我才不管。

　　Happy birthday sweetheart. I love you.  亲爱的，生日快乐，我爱你。

　　It means a lot to spend the day with you.  生日当天能和你一起过对我很重要。