求一句话英文翻译

1. happiness isn't limited to being together with you, but also watching your back when you leave.
幸福不限于和你在一起， 也可以是在你离开时看着你的背影

2. standing beside you defines my happiness, which will live even if you leave.
站在你的身旁定义了我的幸福， 这种幸福会一直延续着，就算你已离开

3. no matter being together or apart, you are the source of my happiness
不管是否在一起，你是我幸福的源泉

4. being with you is the happiest thing in my life. If someday you leave, I will keep the smile you gave me.
和你在一起是我一生中最幸福的事。 如果有一天你离开了， 我会保持着你赐予我的微笑

第一句是最直译楼主的提问的。 不过我更喜欢下面这些选择。 楼主自己挑吧：）