hey, sorry to hear about this.
basically i think you need to try and move on, at the end of the day constant fighting is not healthy, neither is spending so much time with one person. like you have said you became dependent on him. you need to try and make new friends, socialise ya know.
things are tough at the mo, that is the nature of break ups, they suck, but at the end of the day someone else will come along, i mean you will constantly meet new people.
just vent your sadness and try and move on, best thing you can do.