just go to acct. settings, at bottom cancel acct....you will be sent an email notifying ya that its getting deleted and to confirm you really want it deleted....usually takes 1 day but they say 48 hours.
understand about killing the relationship, my chick used to get crazy over things said, i couldnt help wat girls said to me, i prolly shouldnt reply back with some things i said either so i finally just got rid of it. now life is peaceful and shes happy so im happy now to no listening to her mouth! lol