I completely forgot I posted this until now. Thank you everyone for your answers. I think you deserve an update. We ended up dating for only 1 year, moved in together after graduation and while I left on a week-long trip to see my mum the female best friend called me to say she is pregnant with his child and is throwing me out of the house. He did not have a backbone and I ended up homeless for about a month because of that, and never recovered my belongings from that house. They had an affair in the last 6 months of our relationship because she could not stand how close we were and decided to confess, and yet "I was treating him too well to leave me". Oh well. I did sleep with his brother after that, the girl lost the pregnancy, my ex wanted to break up with her over it (quite terrible of him even though I don't like her) but she begged him not to and then cheated on him 🙂 I wish I was making this all up, it sounds like a telenovela!! He came back crawling to me after she cheated (he did not know about the brother at that point) and I accepted, had s*x with him one last time and then told him about the brother. He was absolutely mortified. I almost felt bad but it was worth it. Been happily dating someone for the past 2 years, no female best friends in sight!