Should I stay or should i go?

Yeah...the good old Clash song..
I wonder what i should do..
Damn ... im so ... confused..
Should i leave him because im not happy?
Or will we work out?
i mean ...c´mon we are together since seven years ...
"One day is fine, next is black"
Is this normal? Or is the "big love" somewhere in this world waiting for me?
Does this "big love" exist? Or is it normal to fight that much after seven years?
The black days are so often in this last year ...
But im scared ... scared to be alone.
Its not that easy to dump him after seven fucking years.
The worst thing is that i dont trust him anymore.
But we live together ... and ... damn ... i dont know .. hes a big part of my life ...
What is with my "flirt" from the internet?? are we meant for eachother? Or is he too far away?
Is he the reason why i want to leave? What is when he hurts me and i realize that my boyfriend is the right one?
Maybe i need some break. I wanted this on last monday .... but ... uhm ... i didnt do it because.... well.... i dont dare!!! Im so stupid...i had already packed my clothes ....duh...
Well ... i hate this situation ...