Got emotionally attached for the first time and now i feel like stupid😭

I’m 20M. Never dated anyone before. Very low interaction with girls. I’m shy and usually stay in my own bubble. A month ago, a girl who lives near my flat approached me. She’s extroverted. We started talking daily, meeting in the park, on the terrace, going to college together. It felt natural and easy. She told me: I’m unlike most boys I know how to pamper a girl My shyness is cute She never feels bored with me She also said she never dated anyone before. At one point she clearly said, “We are dating.” We both acknowledged we were emotionally attached. She even used to get jealous when I told her a girl from college approached me. She’d question me, get possessive. That made me feel like she actually cared. For me, this was my first time feeling wanted. First time feeling chosen. I genuinely got attached. Then suddenly… dry replies. Delayed responses. No effort. No explanation. Our last in-person conversation was completely normal and playful. I tried to revive it. Sent reels. Asked her to go to college together. Then I stopped double texting because I felt stupid. Now we have zero connection. The worst part? She lives next door. I hear her voice daily and have to pass her door every time I go out. I just hope I don’t run into her 😔 It was only a month, but it meant a lot to me. Now I feel confused. Was I the only one who meant it? Has anyone else gone through something like this? How do you deal with it when you can’t even avoid the person?