<human>: Can you succinctly summarize the text in 1-3 sentences?

Together for two and a half years, lived together for one year.
 
We were arguing a lot, and I admit to being quick to lose my temper over small things although we both played our parts in making these petty fights worse.

Anyway, tonight she calls me in tears saying she's miserable, misses me, just wants things to go back to the way they were, needs a hug, will I come over, can we get back together etc. 

I feel a weird mix of emotions right now... 

After we first broke up I was crushed, but over the last couple of weeks have come to realise that I was not content in the relationship and would be much happier moving on and being single again. 
I was just  starting to get excited about the future again, I was feeling better, but now I just feel sick. 

We agreed to be friends, but is that even possible right now when she's clearly so devastated? 

I feel awful for her, but also guilty as I am not nearly as shaken by our break up at this point. I feel like I was just starting to come to terms with my new life. Eugghhhhh, I have no idea what to feel right now, but I know I can't get back together with her. Any advice/perspective would be hugely appreciated!
<bot>: Ex-girlfriend desperate to get back together after break up, I want to move on and enjoy a single life but feel crushed by guilt. Need advice.