Absolutely! She obviously has much more time and emotion invested in her girlfriend than she does you at this point and even if the two of you were an item, that is not something I would even dream of saying to my significant other unless there was something more pressing going on with me (i.e., dying, on fire, something like that). I also agree with Adultery on the issue with the age. 18-25 has no clue yet what they want out of a relationship. That is not to say nothing could come of it, but having been there myself and burned terribly emotionally, etc., I would strongly caution against it.