Ok, this is my first reddit story so I'm not sure exactly what I'm doing but I'm going to give it a shot.

So a little background info, I (18M) have a friend (18M) who we'll call "Carter". Carter and I have been friends for quite some time now and we're both in the same art class. This past semester, there has been a group of girls that have sat next to me and Carter in art and we talk to them very often. One of the girls in the group, who we'll call "Mia", has really stood out to me though. She is very pretty, smart, kind, funny, and I feel like we connected pretty well. When we first met in art at the beginning of the semester, I'll admit I got butterflies and I was debating whether I should ask her out or not. I was planning to ask her out that Friday, but before I could, Carter texted me.

He said, "Hey, you know that Mia girl in art. Well I think she was pretty into me and I wanna ask her out. Got any advice?"

Now, I've been in my fair share of relationships so it makes sense why he reached out for advice but I was honestly kinda heartbroken. I was going to ask her out but now I feel like I can't because I don't want to ruin my friendship with Carter. I decided to keep my feelings to myself and help Carter out.

Fast forward to 2 weeks before Prom, and Carter and I are in art talking about our crushes. I asked him who his crush was, and more specifically, if he still liked Mia. He said he never worked up the courage to actually ask her out and that he had lost feelings for her a few months ago. My heart started beating at a million miles per second. I honestly felt so happy and relieved that I could finally express my feeling for Mia. And especially with Prom being right around the corner, I felt like it was the perfect time to ask. That Thursday night, I made a sign that said "Mia, don't be jealous that I've been chatting online with babes all day. I really just want to go to Prom with you, what do you say?". I know it's weird and cheesy but it's an inside joke and a quote from one of our favorite movies. I also went out and bought some flowers and her favorite candies. I was so excited I couldn't wait until art tomorrow when I would ask her.

The next day when I walked into art, I was surprised to find a giant poster that said "(my name), don't be jealous that I've been chatting online with babes all day. I would much rather go to Prom with you anyway. What do you say?" along with a few boxes of Reese's pieces (my favorite candy) on my desk. I looked up and I saw Mia smiling at me and my heart exploded. I pulled out my promposal sign and the flowers and candy and gave it to her. We both said yes and were super excited to go to Prom together.

A few seconds later, Carter walked in the room and saw the class cheering and me and Mia hugging. He asked what happened and I told him Mia and I are going to Prom together. His mood suddenly changed from confusion to disgust. He sounded pretty unhappy and he barely talked to me the rest of the day. I was really confused at first. Maybe he was just having a bad day or maybe his dog got out again or something but when I went to his house to talk to him after school, he exploded.

He called me an asshole for going behind his back and asking his crush to Prom. Now I was really confused. I reminded him that a few days ago he told me he didn't like Mia anymore and if he did still like her, he should have told me the truth. He continued arguing with me saying things like "Mia doesn't really like you" and "she definitely just feels bad for you". I told him that I was sorry that Mia asked me and not him but he didn't listen. He kept shouting at me until I gave up. I told him we could talk again after he calmed down and I hopped in my car and drove home. He called me 137 times that night and he kept texting me some nasty things to the point where I just decided to block him.

It's been 4 days since then and I haven't seen Carter in art or around school at all. I'm genuinely kinda worried now. I don't know what I should have done differently because I really like Mia and Carter should have told me the truth, but maybe I am in the wrong. I need your opinions Reddit. Thanks.