Last week i did work from Monday till Sunday.
This week i have been already working from Monday till today (Friday) and today he still did ask me that can I also work this weekend.
Who the hell can work 2 weeks on a row without a single free day?
Jorgas is right. Learn to say no. Remember that your boss is dependent on you, just as much as you are on him. Doing a bit of extra work now and then isn't a bad thing. But you musn't become the scapegoat for every extra shift that needs to be filled in. I trust you do have other co-workers who could also fill in on those days?