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

We got together when she was just out of college, and about a year after some really intense family tragedy happened for her. Now we have been together 3 years, living together for 2, relocated to a new city together. We've been there for each other through graduate school, jobs, mental health struggles. Have discussed marriage, kids, and considered each other life partners. Now she is saying that she needs to live on her own. Maintains there is nothing wrong with me or the relationship, but that she feels a need to do this to get to know herself more especially in processing her past and before we progress further with these milestones. On one hand I get it. I do tend to know more what I want just from being a bit older and having lived on my own. I think I would accept this more if she also hadn't said that we hadn't ever really defined "life partner" when talking about it, and that we need to decide what that means to us and talk about it further, but that she needs space to even know what she needs from a relationship moving forward. 

It is scary, and I want to trust her even though I feel like the rug has been pulled out from under me. I'm looking for advice for people who have experienced living apart as either helpful or damaging to their relationship, and what mindsets and actions I can do to make this help us evolve as individuals as well as partners and not set us back.
<bot>: Girlfriend moving out so she can figure out "who she is". How to make it productive/not take it personally?