im so sad

i have an online friend, we've been friends for more than 3 months now. we talked everyday, and i really enjoyed talking with him and playing games with him. he's a pretty cool person and i think he liked being friends with me too. i get attached pretty easily so he quickly got so important to me. he's so sensitive so he gets sad and stuff easily. he suddenly stopped talking with me 4-5 days ago. i don't even understand what i did or what happened but he wont reply to my messages or anything. he's a senior so i thought maybe he decided not to waste time and study but i don't know. i'm so sad. i just don't understand how he could just forget about me. i don't know maybe i wasn't so important anyways. i just want someone to care about me deeply. he was sensitive but he wasn't empathic. he didn't try to talk to me or make me happy when i was obviously sad because of him. even when i told him about my teacher always touching me and making me uncomfortable he didn't even say anything he just replied with emojis. like what? but other than that he was a really fun friend, he talked and spent time with me which made me happy. i get so lonely in summers so i only talked with him all this summer. i even wanted to meet him irl. but idk now. i want him to talk to me. i'm being so silly and sensitive.