<human>: Can you condense the text into a few key points?

Just as the title reads. My girlfriend and I have been dating for nearly a year, and she's already asked more than once if I'm buying promise rings, and has expressed her desire for one. My problem is that while I love her very much, and I would do basically anything for her, I don't know if I can make that kind of promise. We see each other less than once a week and it makes it difficult for me to know if I can uphold such a promise, because who knows where she or I will be 6 months, a year, etc. I am dreading her bringing it up because I don't plan to buy a promise ring or anything right now, or in the near future, and I don't want to bring this up with her because it is very similar to "breaking up" with her before actually breaking up.

If it helps, this situation is very similar to a situation in the TV show "That 70s Show" with Eric and Donna. How should I handle this situation? I want to just not bring it up, but if it does indeed come up in conversation, I'm afraid I won't be able to avoid the real reason I don't want to buy them. Any suggestions?
<bot>: Girlfriend wants promise rings to stay together forever, but I can't make that kind of promise with all the uncertainty in life and our distance.