Feeling like a loser without one person

I really liked (still do) one guy who I met last year at the seaside, let’s call him EC. We exchanged numbers and talked for half a year and also met once and slept with each other. I felt calm with him. We had nice conversations. He was mature but also curious and free. Then I got back with my ex and EC also started dating then. But I still liked EC. Every time I got his text, a silly smile grew all over my face. However, it seemed to me that he slowly started ghosting me. He was replying even slower until one day he just didn’t anymore. After two months I texted EC, saying I’m very confused and think like I deserve at least a goodbye. He said he also started dating others and felt like I didn’t want to talk to him anymore (despite I told him twice before I want to talk to him) and then we said our goodbyes. I feel numb, sad and disappointed. I miss him. I want him to want me again. My days seem so blue, I feel behind like everyone is living their best summer and I’m a loser. And then I feel even worse for being in a relationship and crying because of someone else.