My bad can get to fuck.
Currently torn between weeping & stabbiness at someone who has really let me down and their reply was 'mea culpa'. No. No. NO no no no no no NO. You fucking apologise. You say 'I'm really fucking sorry, totally my fault, I understand why you're upset, it was shit of me, I'll do what I can to make it up to you, but I am still very sorry.'
'Mea culpa' is not some fucking let off phrase that means you don't need to apologise for being a shitting fucking letdown to someone AGAIN. We both arsing well KNOW you've fucked me about, and 8 crappy letters showing off how intelligent you are do not improve the situation.