My Rage To Cheating Fiancee Man

[r800atv]

Ok do shooe down here,,, I recently discovered that my fiancee was seeing another man (her ex boss) i followed her one night and found them walking together so I gave him a good beating but whilst i was hitting him he kept saying to me hit me not my car, (I was in a state of rage and cant remember doing the following) after a short while punching him my he hid behind my fiancee and i know i dont hit girls so aparently i wen to his brand new BMW and started punching the car to the extent it had no glass, mirrors, lights, and all panels were dented causing £13k damage.
now after punching him and loosing my mind i can remember my fiancee shouting in my face i looked down to my hands and they was ripped to shreds blood everywhere! I do not recall walking to car smashing it or chasing him around it with a iron bar like he has said in statement.
i need advice on what to do now do I plead guilty to something I cant honestly remember? what could I expect in court to happen?

[ummmm]

Because it's the law section and not chatterbank.