English to Japanese text translation please?

Hi, i am getting something engraved for my girlfriend and want to know which translates best from "I'm only here because of you" into hiragana/katakana out of these. Or if theres is a shorter translation in kanja.
私はあなたのためだけにここにいる
Or
私はあなたのためにのみここにいますよ
Google translate says they both translate to "I am here only for you"

I guess i mean what translates best to "I'm only here because of you".

Please reply soon
Thanks

You should be asking this question to your girlfriend. Whatever she likes is best, no matter how many Japanese may laugh at it. If I were the girlfriend, I’d think that both look (please be prepared for my honesty) dumb, but that's just my opinion as a Japanese female, and it has nothing to do with your relationship with your precious girl.

I think the same way as Uco. The sentence is correct but... maybe you should reconsider it.