"This is the last thought of you."
Maybe try instead..
"This is my last thought of you."
It makes it more personal and adds emotion. :]

"I'm sick of you and your dum jokes."
"I'm sick of you and your dumb jokes."

"I'm sick and tried of thought of you making my life so so tiring and fulled with hate."
"I'm sick and tired of you, you make my life so tiring and fueled with hate."

"This is the last time i will ever say you name."
"This is the last time I will ever say your name."

That should help with the spelling ^.^

This is a very nice poem, however I feel if you were to give it a more poetic structure it could make even better.
Nice job =]