I will always be with you and nothing can part us both.（不离不弃翻译成了 没有什么能将我们分离）
I will always be here with you ,holding your hands till death comes.(呵呵，为了押韵有点矫情，执子之手，与子偕老)
可以按你表达侧重的角度有不同的翻译，
拙作仅供参考，欢迎拍砖~
I will be with you on this way. Wish us would be together forever.
Do not leave nor give
up 不离不弃 I want to stay with you forever.我想一直陪着你
给分啊
I am and I will always be with you
Stay with you, never abandon
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