The End Of My World Or Just Another Chapter?

I’ve been dating Alex since we were freshmen in college. We moved in together halfway through sophomore year, and it felt like everything was perfect between us, until this past spring break when I found out he had a thing for his RA who’s several years older than both of us. At first, I tried to ignore what my gut told me was true but the facts were hard to deny. He would disappear into the dorms late at night claiming it was just studying with friends, but it was clear from his texts and behavior that something else was going on there. So one evening, when he had a study group in the RA’s room, I decided to go up and see for myself. I found them kissing deeply while everyone around pretended not to notice. It was an incredibly graphic scene with no attempt at hiding anything from me, she pushed him onto her bed as he eagerly followed, pulling off each other's clothes faster than a race car on the track. I watched in horror as they began fucking right there on that cheap dormitory mattress, both of them naked and sweating profusely, moaning loudly. She was thrusting back into Alex’s hard cock, her breasts bouncing wildly with every plunge inside her. He buried his face between her legs, licking her clit vigorously while she fucked him harder and faster. I couldn’t tear my eyes away from the sight of them fucking like wild animals until he finally came deep inside her, spilling himself hotly as they both collapsed in a tangled mess. It took everything I had not to break down right there but instead, I calmly left to give Alex time with his girlfriend before confronting him. He confessed it was just one time but my heart broke when I realized this wasn’t about just one night, it was an ongoing affair he kept secret from me the whole time we were together. We’ve decided to break up and move out by the end of summer, even though it hurts like hell. The sex I had with Alex was always so rough and raw that every session left marks on both our bodies, now I’m starting to wonder if he only chose me for my willingness to be his dirty little secret. This confession is more for me than anyone else, I needed to write about all of this and let it go, even if nothing changes now except for the ending.