<human>: Can you give me the gist of the text in a nutshell?

Throwaway:
My GF [22/f] and I have been dating since we were 16, we broke up last year because of stupid fights we have been having, I don't want to get into it to much, but I need help getting over her. Whenever I see her name, or username anywhere my chest starts hurting real bad, and then few seconds later I'll calm down. I've read advice columns online to help me get over, but nothing seems to help, and yes I deleted her on Facebook, and all other social media websites, but her friend's will tag her, or add a picture of her once in awhile, and it bugs me out. It happened again tonight when I saw a mutual friend liked a photo of hers, my chest hurt, and then I did some breathing exercises to get over it. I just don't want to have these pains anymore, I don't know how to get over it, I'm still in love with her, I just don't think we can be together, I don't think she wants to be together. To give some insight, we were each others first, and we were very loyal to one another, and very loving, we both had our flaws that we never worked on, and our fights were about hers most of the time. I realize the wrong that I have done, and I would love to fix it. I just don't know if she would let me, and if she would even fix hers, it's something I'm scared of. I don't know if we can make it work again, and at this point I just want to get over her. Her birthday is next week, and I've been going through the dilemma if I should say happy birthday or not for awhile. I haven't spoken to her since my Birthday in Nov when she texted me happy birthday, so I'm very confused what to do.
<bot>: 5 year relationship, been broken up for a year, still in love with her, chest pains every time I see her name, picture, or username, and want to get over all of this.