Your ex girlfriend has definitely cheated on you. Your cock is so inferior, it's a certainty. Your ex has slept with a black guy behind your back. Can you blame her? She was stuck fucking your itty bitty white cocklette day after day. The poor girl was probably unbearably sexually frustrated. Rather than vilify her for partaking in the pleasures of a BBC, you need to support her. Support all women you're involved with going forward, in all of their sexual ventures. It's cruel to expect a woman to remain exclusive to your small penis. Aid her in getting fucked by real men. Learn to worship huge cocks. Your girl already does.