<human>: Obligatory awkwardness: nearly ten years ago I went to university with a girl I liked. Being awkward and not very confident I didn't outright tell her but just hung around in the same circle of friends, until one day I blurted out that I was in love with her. She rightfully didn't take this well and we pretty much didn't interact for quite some time.

Years pass, I start a career in a different field, see the world, get a job and if I say so myself, matured a bit. I also get back in touch with a few people including her. For a while now we've been going out to see movies or have dinner as "old friends". 

Lately she's been in my life more and more. She's helped me set up my new flat, I helped her out with resumes, we talk pretty much daily about everything and in a couple of days we're going on holiday together.

As far as I'm concerned this was all just hanging out with someone from uni, which is fine by me, but at the same time it's starting to feel like she's treating me - or I'm treating her - as a surrogate partner. Someone to go through the motions with without having a relationship. She stopped dating after we started going out and doesn't seem to be interested in it any more, but at the same time she's not exactly dating me in a romantic sense.

On the one hand, I don't want to assume stuff because "asses, u and me". On the other hand, I don't want to be someone's crutch or hold them back.

So how do I bring this up?

Can you condense the text into a few key points?
<bot>: there's an elephant in the room between me and a girl I used to love and I don't know how to shoot it