It occurred to me a couple days ago that I have had this German guy sitting in my contacts list and I never asked him about the song. Well here was a chance, and I was going to take it so I sent him the song file and by this morning, I had my answer. The song that I have liked for over ten years, clipped and with degraded audio, was So Bist Du by Oli. P. Check it out:
Hearing a higher-quality and complete version is kinda weird. I don't know how to properly describe it but it just wasn't the same song that was going through my head all this time. I still liked it, although I think the beginning could have been better. I'm finally glad to have my answer.
h/t to keira0tash for posting the vid.