I think you answered your own question. However, I think you phrasing that she didn't care about the future escalated the situation rather than you approaching it with having a honest conversation about the relationship and where it was going considering the circumstances. You might want to improve that yourself and be more direct. How you approached it was judgmental.
But, if she can't communicate, then it's not going to work out. Introversion is not an excuse. I heard something recently that made perfect sense and is something I want to modulate in my life - the quality of any relationship is based on the ability to have uncomfortable conversations.
