Certainly! Here’s a revised version of your essay in proper English:
I have come to accept your decision, and I believe that we are on good terms for now. However, before I leave, there's something I need to share with you. Do you remember the day I saw your conversation with Kopano, where you asked him to reach out to Kholofelo on your behalf? I found that disrespectful, yet I chose to stay because I love you.
I also recall the time I discovered a picture of your ex-girlfriend, Thulisile, on your phone, only to find that you had deleted the conversation. That was another moment of disrespect. It seems that my actions, which may have been minor, have turned into a significant issue between us.
Even though this hurts, I understand that it's time for me to move on. Goodbye.
Feel free to make any adjustments to better reflect your thoughts!