I know this isn't a happy topic, but i wanted to tell you this fact that i lived, that is a friend i've lost for a while.
I had begun to talk to him, if i didn't mistake, in the fourth or fifth grade. After a while we've met well, we started to laugh, play, do homework, go on a trip, etc. Until the high school arrived. Because we had different opinions on what to do after finishing the studies; we frequented, of course, different schools. Both me and him were making new friends in our respective schools, but at some point we met less and less (about every two weeks) because he had much more to study than me and then i accepted the thing. One day i tried to write the reason several times, but he answered that he was always busy with the studies and his private life, fortunately occasionally we're able to meet together going to parties or going around the city on bike. After in the third high school, i was engaged with a girl and he was happy about it and told me that when he had time, he wanted to know her (then after almost a year i left with her for various reasons that i will not explain to you for me and her privacy). After about a month he invited me to a friend's birthday party and then there we talked about everything. About a week after that party, one day he blocked me on WhatsApp and then i tried to call him but he never answered, i went to his home but no one answered, although i knew which days he was at home. From that day i didn't hear he anymore but after several months i saw him in a disco with other people, but i was so furious and i didn't go to him for explanations, i still blame myself to haven't gone to him and from that day i never saw him again and still today i wonder where he has gone and i never knew what I did wrong with him.
P.S. I apologize in advance if some words seem confused.
If you want to write your own experience, you're free to do it.