breaking up...when a relationship ends it hurts?

wow, my first bulletin and is a sad one...why it seems for me like i did not broke up my 3 years of relationship?... is normal to feel this way? for my ex everything continued the same.. he just went to work, no crying, no fighting, just a desition i make... i'm so worried that maybe i over react... he doesn't tellme nothing... whe dont chat any more, we live in the same house, sleep in the same bed but there's no comunicaion... he always tellsme "i dont feel like chatting right now" or "i dont need this"... is this simple to end a project that i had visualize to last for life?