What should I do if I still have maybe feelings for my ex one year after breakup? He hurt me very badly?

My ex left me one year ago. He left me in a very bad way while saying that he wanted a little break from our relationship and after that he didn't say a word to me acting very cold, while I was waiting for him the whole time. He was my first love and I loved him very much. That breakup hurt me a lot and I needed a lot of time to be okey again. I never wanted for us to split up. I did everything for him. Six months after the breakup while I was out i send him a photo just to see how will he react and he didn't even open my message after everything he did to me and he never texted me since our breakup. It has been a year now and i am seeing someone new but I have many times moments where I just think of him and start crying. I start comparing everyone with my ex. When I think of our memories I have still this sadness in me that just doesn't go away all the time. I always wanted just to talk to him but I am too scared to say anything to him because I don't want to be ignored again and seem desperate altough he still follows me on social media. But he hurt me very badly and I just can't seem to rid of this sadness in me and memory of him everytime. What is the best thing to do?
What should I do if I still have maybe feelings for my ex one year after breakup? He hurt me very badly?
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