<human>: Can you give me the gist of the text in a nutshell?

We met in college, went through the same major together. Typical, occasional rocky patches, but we always found a way to work on our relationship together.

When I came into this relationship, I was anti-marriage but pro-long term commitment. As the years passed by, being with her had me rethinking that mindset. I began to picture what it would be like to marry her, have kids and dog, the whole nine.

A few weeks ago she told me, without prompting, that she has a hard time imagining those same things with me. She isn't sure that I'm the one she's "supposed to be with" and that we should break up, because she believes that it isn't fair to be with me if we don't feel the same about each other.

Intellectually, I agree with her, it may not be fair. However, I love her and have for a long time. She still loves me, but doesn't want to run the risk of us not being right for each other.

We have been split up for a month, and we're still friends. She has gone on a few dates with another guy since, but she admits she isn't seeing too much potential with him, and doesn't want to run out into another relationship right away. I haven't seen anyone, but that doesn't really bother me. I'm still sort of in heartbreak mode. We did hook up a few nights ago (probably not a great idea, but the sex was good and we haven't experienced any post-hookup awkwardness.) but we both know that having sex isn't going to suddenly heal our split.
<bot>: My girl dumped me because she isn't sure that I'm the "one", but both her and I think I'm still in the running.