<human>: Can you provide a brief overview of the text?

Only just broke up with my gf of almost 2 years because I'd thought I'd be honest with her and tell her that at the moment I couldn't see us getting married or furthering our relationship.

I had been trying to convince myself to bring this up for a fair amount of time because I don't want to string her along especially if I finally make up my mind and decide that I can't stay with her another 2-3 years later. It's just not fair.

I do love her, but can't bring myself to commit to anything more, at least for now. 

We cried, fought, and talked for hours. All of that time I kept thinking to myself that I've made a massive mistake. I have never felt this way about another girl before, not that I've had many girlfriends. There were just all the little things and quirks that I loved about her that I kept noticing as this went on. All I wanted to do was hug and hold her. Tho through all that I found myself no closer to any feelings of greater commitment.

Additionally I do have depression which I am not getting treated for, so my mind is a little f*'d and find it hard to have any strong positive emotions. This probably played some role.

She confessed that she thought/thinks I am 'the one' for her, which just makes me feel worse

Did I just make a giant mistake? 
Should I trial moving in together just to make sure? ( kinda mutual idea)
<bot>: Broke up with gf because I couldn't commit. Fear I've made the biggest mistake of my life so far.