What is the right thing to do?

Hi everyone. I need some advice. There is a guy who I will call “Mark” and we have a very great connection with, but things were rocky to begin with. He confessed he wanted to be with me in December of 2017, however I was, at that time, dating who is now my ex boyfriend. We broke up in January. My ex treated me poorly and I am happy to be out of that relationship. In March, I realized I was starting to fall for “Mark.” We seemed to be hitting it off until April, he starting acting distant. I asked him why and he said he “was not over December as he confessed his love for me but I still chose my ex.” I felt hopeless, and his distance grew more. He stopped replying to me until days later etc. So I took May to focus on me. I deleted all social media, and focused on my happiness. I had no contact with Mark. I was hurt already for the year and I felt Mark was doing the same. My question is what should I do now concerning Mark? I reactivated Facebook tonight so he has not contacted me yet. Will he even reach out or just ignore me more. What should I do now?