<human>: Can you summarize the given text in a few sentences?

Our relationship is young, and my girlfriend just told me that she wants me to be her last boyfriend out of the blue. Simply put, she wants us to get married someday.

We're young and I'd love to marry a woman like her, she is nice, honest, loving, caring, simple, and smart all the things I like in a girl. The thing is its too early, we're 20 year olds, what do we know about life, marriage and all that jazz... I don't know how to approach and tell her that I'd love the idea of marrying her, but we can't say for sure that we will love each other like this in a few years, our relationship has not been tested by time and relationship problems yet... I want to tell her that we should just enjoy what we have right now, and not look too much in to the future like that, if our love survives the test of time and we're happy together then maybe marriage is a possibility, but right now I don't want to think about that just yet its just too EARLY...
<bot>: Girlfriend suddenly tells me she wants me to be her last boyfriend, but its way, way too early in the relationship to tell, I don't want to loose her or hurt her feelings in explaining this to her...