I'm sorry if this is trivial but I could really do with some words of wisdom. Eight months ago I left my physically and emotionally abusive DP after five years together. I had totally reached rock bottom by the time I left, I cannot describe how bad I felt about myself at the time thanks to his constant bullying, the violence and his cruel manipulation. The final straw was when he tried to slam my head in a door after a particularly vicious outburst and I literally left the next day when he was at work. I walked away with nothing - I had lost all my friends as I wasn't 'allowed' out (and on the rare occasion I did my 'D'P would accuse me of cheating and be very aggressive), I left the home we shared and moved in with a relative, and my self esteem was in tatters. I went through a very dark period after this where I truly hated myself, constantly believed I was to blame for the way my ex treated me and contemplated suicide. He was very angry when I left and harassed me for a long time so I ended up getting a non molestation order out on him which gave me some peace of mind.
Fast forward to now and I have slowly started to rebuild my life with the help of AD's and therapy as i was diagnosed with clinical depression after the break up. I have hobbies and have made a couple of friends but I still feel very fragile.
But something happened this morning that has tipped me over the edge. I work part time in a big city and when I got off the train at the main station I saw XP with his new girlfriend. I was totally shocked as I have actively spent the past eight months avoiding him and yet there he was, slap bang in front of me with his new girlfriend. They were holding hands and laughing; it hurt like hell to see that. I hadnt seen him since the break up and I have constantly been looking over my shoulder for fear of bumping into him. I even changed my job so that I would be working in a different part of the city from where he works but for some reason he was in that part of town today.
He didn't see me (I don't think) but I felt really upset to see him with someone else. I know that sounds very juvenile as it is normal for people to move on after a breakup but seeing them looking so happy just floored me. I also feel angry that he put me through hell and yet he has carried on with his life and I have struggled to even exist, let alone live. It has also brought up those feelings of wondering if i was to blame for his behaviour towards me? He seemed so happy with his new girlfriend and I can't imagine he would treat her the same way he did me.
I am so sorry that this is self pitying and trivial compared to what other people go through but I just feel lost and keep thinking 'what is the point?' I really feel so lonely and came home from work early as I was struggling to keep my emotions in check. I am trying to be positive but there is a small part that wants to end it all. I am scared and just want to be the person I was before I met him but I fear that I will never get back to that 
Sorry this is long. If anyone has been in a similar situation I would really appreciate your views and advice. Thanks so much.