Don't judge

Ok so please don't judge me or call me a slut or whatever. I've been with my bf for about 8 months now. There's a whole story behind how all this happened but basically I fucked his twin brother, without realising it wasn't my bf. Ik it's wrong for me to say this but he was so much better in bed, so now I don't really no what to do. Cause I have really strong sexual urges all the time and he just never wants to do anything.