My gf is cheating on me with a black guy. Should I dump her?

I’m a white guy, and I’ve never cared about race. My girlfriend is also a white girl. I lived with a black roommate before and we’re still friends. But for some reason, my friends say I should dump my gf since she’s cheating with a black guy. I asked her about it, she said she never thought race would come up and it’s a stupid reason to dump her anyway.<br><br>I’m really not into racism, I just want to know what you guys think.