I implied that I was seriously ill to get my partner to do our entire assignment
Why would you do such a thing to your partner?
I wanted him to do all the work. I'm lazy.
That's wrong to lie about that to your friend. If you weren't ill, you should just do your work.
Life is not fair. I should be able to get away with this. He doesn't know any better and I'm a nice guy.
You may get away with it now, but you won't forever. It is bad to lie about things. You should be open and honest about your part in the assignment.