From 2 AM calls and dates every week to 3 months of dead silence. Tomorrow I 20M have to sit next to the girl 19F who friendzoned me. Help.

I (20M) liked this girl (19F) from my college, and during a vacation, I literally travelled to Dubai just to meet her. She seemed really, really excited to see me, and honestly, I thought she was crazy about me too.

The next semester, I started liking her even more. I really thought the feeling was mutual and that she was just cool. We started going on multiple dates. We'd talk almost every single day, often staying on call for hours after class. Like, 12 AM to 2 AM straight, every other day. We flirted, snapped each other constantly, and talked about everything—family, friends, life goals.

By the end of the sem, I was 100% sure she liked me, so I confessed. And she told me she only likes me as a friend. Like... how?? How does that happen after late-night calls, dates, and all that flirting?

After she said no, we agreed to be "good friends" because at the time I thought that was the best thing to do (did I lose time and hope? yes, but I didn't want to lose her as a friend). But later, it really hit me. It's so over. I fell into a super dark place. I even had thoughts of self-exit.

For summer break, I went back home to my parents. I hadn't seen them in 4 months, and they were so excited to talk to their college son face to face. But I was so broken I couldn't even have a proper conversation with them the entire vacation. And I couldn't tell them why.

Now, college starts tomorrow. I haven't spoken to her in three months. We went from talking every day to absolutely zero contact. Here's the worst part though: in a few of our lab classes, we literally have to sit right next to each other. Our roll numbers are adjacent and the labs have a strict roll-wise seating arrangement. I know it sounds fake but it's my actual life right now.

I have to see her in person tomorrow and sit next to her. What do I even do? How do I act? Thanks for hearing me out.

TL;DR: Thought a girl (19F) was into me (20M) after dates and late-night calls. She friendzoned me. Fell into a dark place over the summer and went no-contact. College starts tomorrow and we have adjacent roll numbers, meaning I'm forced to sit next to her in labs. Need advice on how to survive this.