How Can I Forget It?

Hello, I am a girl of 19 and I have been separated from my boyfriend for a month. In general, our story is very confused, at first I was not interested in him, and he clearly showed his sympathy for me, this sincerity scared me, I was afraid to let him in, I was afraid that he would hurt me as has happened in my previous relationships. He promised me that he would never hurt me and things like that, which I must admit I always wanted to hear from someone. He was constantly interested in me, which made me think that maybe it was right to open my heart and give him a chance. And so, gradually, to say that I loved him, I realized that this person is really different - caring, good, we have common interests and we definitely complemented each other. He is four years older than me, he works in sports, he meets a variety of people every day, including many beautiful girls. Several girls have invited him on dates, but he refused because of me, for which I am grateful that he did not have a parallel relationship while he was with me with another girl. Thanks to his busy schedule, the time we spent together was getting less and less. He came home late in the evening, left early in the morning .... Then I had to leave Sofia for Varna for the summer with my parents, he told me that he would be waiting for me to return in the fall, when my semester starts ... I have been here in Varna for a month, since I came he has never called me, I wrote to him and he only saw him. It is said that eyes that cannot be seen are forgotten, apparently the same happened to us. Suddenly it's all over, and I don't know how to forget it, I keep thinking about some things, that we had together for this one year, how happy I was. The truth that I can't figure out on my own how to forget it and how to balance myself at all, how we got here, why he suddenly became estranged, and he supposedly loved me and said it ... Do you think that my mistake is that have I never told him that I love him, that I have never shown my feelings for him so openly? Yes, I love him very much, but does it matter now ...