All possible signs, has bf

A fellow student shares a same class as I do. When we first met, at least I thought something was there. And I could swear there was. She was and still is looking at me all the time, facing me, talked about me to her friends before we even began talking. We talked well, common interests and all that and once again, obvious signs. One good day, after having spent a good time together and getting home, she suddenly changed her pfp to herself with a boyfriend, well well well. The day after, I casually overheard her saying how I ‚obviously have feelings for me‘ which I thought was just crazy. I decided to politely cut contact as I don’t have time for overthinking and all that while in college. For me, no contact is literally no contact you know. After class, she texted me apologising over some mistake in class… and then says she didn’t like me not saying hi to her, how it‘s the very least (…) one should do and how talking normally should be possible (I totally didn’t say no contact). Finally, finishing by implying I lack respect was her final message. During all this time, she never even bothered to give any kind of closure, absolutely nothing, she didn’t even really reply to my no contact message besides a ‚see you then‘. I‘ll just keep ignoring her tbh, she still looks and all that but I don’t care. I feel like I was played with and I‘m protecting my own peace.

Long story yes, apologies for that. Hearing different opinions would help me because I honestly don’t know of I‘m overreacting or something.