About 16 years ago I read a book where the main character was a male bisexual (I can't remember his name) who ultimately kills himself at the end. The plot went something like main character lives on fringes of society, carries weapons, and lives in an apartment paid for by his absent father. His lover is killed (I forget by who). He takes a new female lover (who may have been called Angelique but may not be) who has had her brother digitized and stored in a pendant which she wears. When they break up he inadvertently releases the digitized version into the internet where it gives him a sound file to play to the girlfriend which drives her insane. He then kills himself by blowing up the (levitating) building they are in.
I remember it because it was violent, had lots of cool tech in it (ipod like devices, hoverskates etc) and the main character talked about music all the time. It discussed things like digitizing people and street cameras to watch people earlier than other stories which I had read, and so discussed the "near future", parts of which have now arrived.