I'm a 24M. My GF, the only girl that has ever shown interest in me, broke up with me. Now my self esteem is at the lowest point in the last two years. More info inside.

I'm a 24 year old guy. I used to be extremely fat, 163kg / 360lbs at the most. Here are two pictures from 2010, but I was not at my biggest here: http://imgur.com/HD0HLGV (I was actually even fatter than this at some point)

The spring of 2011 I decided to do something about it. I started an extremely challenging diet and work out program. By spring 2012 I had dropped 50kg to 110kg / 243lbs. I am still the same weight now, but I gained some muscle, though my belly is still quite large. I am considering starting up the dieting again, but I'm not sure if I can find the motivation for it.

Girls never seemed interested in me (understandably for me considering my looks), but a year ago that changed. I started dating the only girl to ever have liked me. We had a relationship for almost a year, but two weeks ago she broke up with me, saying she I was the nicest guy and the best boyfriend she could ever have imagined, but she no longer had any feelings for me more than a good friend. My heart is broken. The only girl who ever showed any affection for me, I've somehow managed to scare away. I feel horrible. I really love her.

I might be posting this in the wrong subreddit (as I'm mostly ranting about my breakup), but I really really want your honest opinions on how I look, and maybe some suggestions on what I can do to change.

http://imgur.com/OAhPSIM http://imgur.com/X3OHaCK