You're and your

Tim im'ed to his work-girlfriend "your cute". Awwwwwwwwwwwwww. Not that I have been introduced to her or even told about her by him and I am angry about that. What a sap I am. Her name is Liz something and according to Tim she is semi-retarded and very lonely. He says he feels sorry for her. Oh, I've heard of that but the word wasn't 'sorry'. And she's smaller than I am. She must be a midget! So, the correct usage and spelling is in this example: When you're going for your GED, make sure you're well-rested.