Here’s a more polished version of your message:
“It seems you never think about me. This is why I prefer us to leave on Saturday. I have school on Monday, and I want to use Sunday to clean the apartment and rest for the day. I can’t spend Sunday doing everything when I know I’ll be going to campus the next day. There are things you don’t seem to realize about me. You may not understand how much joy I experience when I'm with you. It feels like you don’t really know me, Kabelo; you just claim to understand me. The only thing you seem to recognize is that I love you. What kind of relationship is built on that?”
Feel free to adjust any part to better suit your voice!