how do i drop a talking stage and am i the problem

15f never had a relationship or anything even close and this guy 5 months younger than me that i dont actually know at all asked for my snapchat on friday and i do NOT vibe with him at all but hes set me up in a way where i feel like i cant leave. Okay this post will be a bunch and bunch of complaining but ill try to only say the things that ticked me off the most. When he first asked for my snap he started texting me alot during class and it went from "your outfit was very cool today" to "hey wanna meet up after school? and hoe should we say hi since yk were not gonna be all kissy kissy at first haha" wich i wasnt thinking of being that at ALL, but i managed to squeeze myself out of meeting him. another detail is that its break right now, so weve been just texting these past four days and hes been very very clingy in a bad way. On day one he says he had a deep talk about me with his hb and that he told his MOM about me(also doesnt help leaving because she is my fucking TEACHER) , and when i said woah dont you think this is abit too much too fast (in a more fawning way) he got mad, then apologised while saying how bad his day was and then told me not tp blame yourself (why mention it then??), also in the apology he told me hes never felt more loved by anyone than me and i just think thats fucking crazy to say at this time and he should try to fix this unrecieved attention problem without getting into a realationship first. hes also been talking about what my parents whould think about him and again its only been a few days and we havent even really had one irl conversation. it might just be me whos overthinking this but this feels like some lovebombing set up. I really feel like an asshole just being mean to this poor guy and maybe i am the problem (if i am pls tell me straight up) but even without all of this i just do not see it lasting at all, how do i leave in the most 'quiet' way (since of freaking course all of my bullies and classmates know atp and i dont want it to worsen my already shit reputation)??