My boyfriend cheated on me with my cousin.

I'll give some context. My boyfriend and I have been dating for about two years, and things were going great. We have a lot in common, he was my first and we knew each other for a long time. Everything was going great.<br><br>Today, I was going through his computer, and I found a video. The video was of my boyfriend having unprotected sex with one of my cousins, Candice. Candice was like a twin sister to me, we were spoiled together, knew each other for our entire lives, etc.<br><br>I was devastated. I couldn't believe my boyfriend cheated on me, and more than that, cheated on me with my cousin. He even recorded the video and had it sent to his phone. The most disgusting things is that she was pregnant in the video, even though my boyfriend had no idea that she was. I checked the date of the video, and it wasnt recent either.<br><br>Candice is now 8 months pregnant, and I have a feeling that my boyfriend is the father. I can't believe that this happened, Candice never liked my boyfriend, and my boyfriend never liked her. <br><br>What should I do?