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aaaaaaaaaaaaaaaaaaaaaah, use punctuation marks!!!

tebya is the "familiar tone"
vas is the "respectful tone" as you would say to strangers or older people.
Like in french "vous" and "tu".

If you talk about eternal love, use the "tebya".

But...

First of all, change "Vas" to "tebya", unless your girlfriend is a perfect stranger or a 75 year old mother of six. girlfriends usually take the familiar term "ty". So: kogda ya govor'u, chto ya...