My (18M) SO (19M) had sex with my roommate (18F)

Tl;dr; - My SO cheated on me with my roommate. Its been a month and I dont know what to do. Advice please.<br><br>I'm in college, I'm gay and so are the 2 people involved. I'm going to call my roommate Jane and my SO Corey.<br><br>My SO came to college with me and Corey and I braved it together. We were together before we left high school. He had no problems with me having a roommate, though for the first few weeks I did try to keep things platonic because I didnt want to have an awkward roommate situation.<br><br>Corey and I made an agreement about hook ups that we wouldnt do it in the dorm and only do it when one or both of us were away from campus. Corey goes home a lot on weekends and I usually stay at campus.<br><br>So at the beginning of this semester, I had a weekly class at 7am. This meant I had to wake up at 5:30 to get ready. Jane was a very heavy sleeper and I didnt want to wake her up at 5:30 every day so I started setting my alarm for 5:15, getting up, putting in my airpods and sitting in the commons area to get all my stuff together for the day.<br><br>One day, I woke up at 5:15, put my airpods in and Corey was in my bed with Jane and they were having sex (with a condom). I was so shocked and hurt, I mean I had no idea this was happening. I grabbed my stuff and got out of the room, collecting my thoughts and deciding what I should do. I decided to go back to the room and I acted like I had no idea what was going on. I said "oh sorry guys, I just need to get ready for the day, I'll be out in 15!" And took my stuff and I left. By the time I got back, Corey was gone and Jane was acting completely normal. I acted like everything was fine and we had a completely normal day. When Corey came back that night, he tried to talk to me about what happened but I was so angry and upset and I didnt want to hear it. I told him to leave and he said he'd talk to me the next day.<br><br>He told me that it had only happened one other time (in my bed) and that it was a "mistake" and he's "sorry" he loves me and didnt mean to hurt me. I told him I was going to break up with him and he started to panic. He begged me not to, he promised to do anything to make it up to me, he said he'd do whatever I wanted. And then he said that he would do anything for me as long as I didn't break up with him.<br><br>I said "anything?" And he gulped and said yes. And i said "well then, you have to kick your best friend out of his apartment." Corey has 2 best friends from high school and they both go to different colleges than him, so he's been letting them stay in his apartment for free (with his parents permission) and I never liked this set up because I hated having them there and I always felt like they were plotting something behind my back. So he immediately agreed and he texted them to tell them to get out of his apartment before the end of the month.<br><br>I told him that I was only staying with him because I loved him so much and I wanted to help him become a better person. And I told him that if he messed up again, I was gone for good. He agreed.<br><br>It's been a month since then and everything has been completely fine. I've been seeing some minor changes in his behavior, he's definitely being more considerate of me and been more helpful around campus.<br><br>But despite all of the good stuff that's happening, I cant get over that day. I have never felt so disrespected and violated in my life. I cant get over feeling hurt that he had sex with someone in my bed, with someone I live with. I cant stop thinking about him doing it with Corey and I cant stop thinking about him getting off to the idea of cheating on me, with my roommate. The worst part is, we all still live together. Not only have I had to deal with this emotionally, I also have to deal with the fact that I have to live with both Jane and Corey.<br><br>I'm so confused, I love Corey so much and I dont want to end our relationship, but at the same time I cant keep feeling like this. I cant keep picturing him with Jane. What do I do? I'm so confused.<br><br>Edit: Wow, this got a lot more attention than I though it would. Thank you to everybody who commented, you guys have been very helpful.