Actually I've been by your side all the time.
事实上，我一直在你身边。（个人觉得用完成时比较好，过去是，现在仍是）
希望对你有帮助
I'm there at your side 安装个有道词典就可以自己翻译了
I am always with you.
I am beside you all the time.
I am with you all the time.
I have been at your side.
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