He Stopped Talking To Me Suddenly

Hello. I'll start from the beginning. I had a friend, we wrote to each other every night, and during the day at school we were constantly looking for each other and talking in the breaks. So after school we stopped at a bench and sat and hugged and talked about how our day went. One time we were sitting on the bench again and we were hugging and talking and one of the teachers from our teacher passed by and saw both of us, we were super uncomfortable. Because only 2 people knew that we were boyfriends, we just didn't want to tell the others, because nobody cares what we say. And I really hoped that this teacher wouldn't tell the other teachers that we were together. So 1 week passed and he stopped talking to me, writing and calling. I asked him if I had done anything, and he told me there was nothing. And so for 1 month we did not talk or write. I still have feelings for him, and I don't know what to do to get it back. I really like it. PS In fact, he didn't tell me he wanted to be just friends, he just stopped all contact.