Help me please! I don't know what to do.?

i was supposed to have a study group with 3 of my friends. one of them is the guy i kinda like. They were supposed to come to my dorm at 12 today. I assumed the guy i liked, calvin, wasn't gonna come because i didnt get a certain answer about whether or not he was gonna come. But i waited with my other friend who came over ,Becky, who came at 11:30 to hang out, until 12:20, and no one showed up. So i called my friend Helena and asked her if she was coming. She said something like "No one's gonna go, so i'm not going." which i thought was odd, because i was talking to my other guy friend Joe the night before and he said he was going. But then, i assumed that they talked this morning and he changed his mind and wasn't gonna come, so i left with Becky. Needless to say, I was fuming. While on the road with Becky, my roommate suddenly called me and told me that Calvin came, so i was in a situation. Becky had to go pick up something and then go to work, so she couldn't take me back to school. And then Joe called me and i told him that Helena said that no one was coming, so i left. He sounded really pissed and was like "ok well i'm going home then. Thanks a lot." My roommate then texted me saying that Calvin went to the library, if i was able to come back soon. I begged Becky to drive me back, and she reluctantly did. When i go back, i immediately went to the library but couldn't find Calvin, so i left. Our final is on Monday, and i'm worried that what happened today will change our friendship. I've cooled off, but i'm worried that they're all mad at me. I know it's my fault. I shouldn't have left with Becky, and i shouldn't have assumed that they weren't coming just because Helena said so. I don't want this to ruin our friendship. What should i do? I've apologized to them too.