曾经我们的爱已经不在,但我仍然无法释怀,现在我再次拥有了你,我一定会好好珍惜,相信我,我会给你幸福!一颗爱你的心,依然在等你
Our love was gone,but I still linger on the golden memories we shared together.Given me another chance,I will well cherish our love.Please believe me!I will give you happiness to my best!Here is a heart crushing on you,and a heart waiting for you as well.
水平有限,提出个人意见：
原英文错误不少,也有表达很别扭不自然的地方,给你修改了下,大致如上,
“Once our love was gone,I still couldn't be comfortable about it.Now I can be with you again,I will be cherish it.Believe me that I will give you the happiness forever!I love you from my heart.I am always waiting for you.”
这个不叫英文,叫“中式英语”,很不地道!