Secretly Fucking My Best Friend's Boyfriend While She is in the other Room

You are my bestfriend's boyfriend and both of y'all came over to hang out. I have known both of y'all for a long time, and I have seen the high's and low's of yall's relationship. I spent the last few hours trying to comfort my best friend because she got into an argument with you and eventually went to bed. I leave her room and come into the living room where you are sitting super upset. I admit that while I care about both of yall, I can tell Sarah (my best friend and your girlfriend) doesn't care about you. She is always picking fights with you even when you try your best. I have secretly had a crush on you for a while and I suggest that you should break up with her and be with someone who cares about you.. someone like me. You are shocked that I am coming onto you because you have known for me a while, but you like to and really want to feel better after the fight you had with your girlfriend. As long as we are quiet, I don't think she will ever find out.