<human>: Okay, so thing is we broke up about a year ago and I know it's high time I move on and I have but I just saw her Instagram profile and all I see are ten pictures of him and her of them celebrating the day together. Now, my issue isn't that they are together but we were in love, like actual love and when it was my birthday she didn't do a damn thing to try and make me feel special , not a damn thing. I had to beg her to wish me a happy birthday. I hadn't figured out by then that maybe she didn't like me, but she treated me like a dog, I was sitting on the floor crying on what was supposed to be my birthday.

I guess I don't understand that what did I do wrong, she cheated on me and I forgave her once but what was I lacking in? What had I done that made me not deserve the smallest bit of respect or love. Where did I go so wrong? I just needed an outlet because being a guy , I don't have many people who I can talk too or open up too and it just hurts alot sometimes. 

I know I should grow up and move on but it just hurts that I went through hell for us to work and I was left with nothing at the end of it.

Could you distill the essence of the text into 1-3 sentences?
<bot>: My ( 19,m) ex (19,f) is posting pictures for a guy on his birthday non stop when she didn't lift a finger to do even the slightest bit for me when it was my birthday.