My boyfriend (19M) is in a fight with my best friends (20M and 21F) and is trying to make me (18F) choose sides

I have been in a relationship with this boy for 2 and a half years and we are in our first year of uni. We changed unis at the end of summer and we are very close to eachother (about a 15 minute walk) which has worked out well in terms of living together. I've known my best friend (Charlie) since childhood and has changed gender over the course of the relationship. (Charlie is all male pronouns and I will use they for my boyfriend). He has just moved over the country to go to the same uni and he and his girlfriend (Bea) are aware that my bf and I are living together. We made sure that they could live in the same halls of residence as us, but as neither of us are actually students of this uni, I can't really tell them to back off and they have been making an effort to involve us.&#x200B;<br><br>I was doing some group work last week and had to go into uni. It was the first time many people in my course had met me and my boyfriend was in the same group. At the end of the class they were all packing up and my bf made a comment saying that he "was surprised he hadn't thrown me over his shoulder and carried me off by now." this was a joke about cavemen and a reference to the Disney movie Tarzan that we all watched as kids. Anyway, one of the girls was shocked and asked me if I was okay and I said I was because it was just a joke and they believed me. On Monday my best friends saw me in the canteen at uni and were asking me questions like "is everything okay, do you need help, are you still okay with him?" and I told them that they didn't have to worry about me. When my boyfriend came over the table to join the meal my best friends got up and went and sat at another table. He asked me what was going on with them and I said it was fine. I didn't want to tell him that they were asking me about him in case it came off as me talking about him behind his back. Anyway, on tuesday my best friends and I had a lecture together and were sitting together. He walked in about half an hour through the class (he doesn't go to uni at all btw) and saw me, the only girl, sitting with two men and he shouted across the room asking me "who are you hanging around with, are you okay?" I whispered to him that I was fine and to be quiet. He shut up and then texted me saying I should get out while I can, implying that my best friends and his girlfriend were gonna do something bad to me. He left the lecture and said it was because he was scared for me, but I think it's because Charlie and Bea were being mean to him. Then he said that they were being dicks and I should choose between them. I said no and he said that I'm spineless for not standing up for him. Then I got a call from Charlie asking if I was okay and I said I was but he said that I shouldn't be hanging out with my boyfriend anymore. I said I can make my own decisions but he told me I should listen to him because he knows better and he's looking out for me.<br><br>I really don't want this to come between me and my boyfriend. But at the same time I don't want to lose my best friend. I feel like I'm being guilt-tripped but I don't know what to do. My boyfriend is going out tonight and he was going to bring back food but he says that he won't if I don't side with him.<br><br>TLDR: I has been with my bf for 2 and a half years. My bf made a joke and my best friends think he's being abusive. They want me to choose between them and my bf is hiding my food. I'm being told by loved ones that my other loved ones are treating me badly.