My (f23) boyfriend (m24) tried to break up with me because I wouldn't have a 3some with him and his brother.

I need to preface that I'm a poly person who's been dating my bf for 6 months and we've been poly for 3 months now, but have only had 1 other partner each and that was mmf.<br><br>I'm hoping you guys can help me work out how I feel, and help me figure out what to do. <br>This has been a pretty weird and hard week for me, and it's not over yet. <br><br>On tuesday my bf asked me to add his brother on socials so we could set something up, he mentioned he hadn't had sex with a partner since lockdown was over and thought I'd be more comfortable having a 3some with a familiar face. I was like...ok. I wasn't too sure about it but at the same time, he's his brother so it wouldn't be a random encounter? <br>I added his brother, we chatted through messages, and planned to meet up saturday night, so 3 days later. We'd met before because he visited when I first moved in with my bf, but haven't since. So I was a bit nervous, but the time it took to set something up was fast and I was still thinking about it and unsure. <br>I told my bf about me being unsure, but he said i'd be fine, and that his brother was excited to meet me without my clothes on. <br>my bf is an ass sometimes, he's not a bad person, but he'll say things like this that annoy me, especially since I was still unsure. <br>On friday night my bf and I were watching a movie together and I told him that I wasn't feeling up to it and didn't think I would be able to meet his brother tomorrow night. My bf got pissed right away as I assume his brother already made plans to see us. He said he already told his brother I was excited to meet him and I was just playing hard to get. I said no, I was never excited, I was a little uncomfortable doing it with someone I don't know. This started a big fight and my bf just got up and left to go to his brother's place. <br><br>I was so confused and my brain kept going back to "he already told his brother I was excited to meet him and I'm just playing hard to get...". I felt fucking slimy. <br>My bf came back around 3 am and spent the night here, but we didn't talk at all. I thought "hey, maybe we can just talk in the morning, and it'll be better" but nope. I woke up and he was already gone with a note saying he's not my erotic partner anymore.<br><br>I called and texted him all day and he wouldn't respond at all. Finally he said he's not leaving and that I can go find someone else who's more willing. I'm fucking heartbroken man. I don't even know what to think anymore. I'm angry, sad, and confused. <br><br>But the reason I'm posting here is that I don't know if it's my fault. I don't know if I over reacted or ruined things or if he did. <br>Did I fuck up? Is it my fault that we broke up?