What should i send to this guy?

was dating a guy and the last two months we were together he cheated on me with this girl and the whole time he was asking me to marry him and have a baby and i was telling him NO so maybe i gave him the wrong idea as of how i felt about him but idk anymore the next day he just broke up with me when i found out about them. whats a good message to send him thats really mean and will make him feel horrible but at the same time let him know i stilll love him n want to be with him even after everything. ive heard over and over and over that he is stupid n i dnt deserve all that but ive never felt this way about anyone im determined to get him back in my life. its come to the point to where i dnt even wna be around anyone else and i cant help it. will sumone just plz give me a good idea as of what to put in a message that i can send him that will make him feel horrible about it, one thats CRUEL?? and tells him how i really feel..... i just want to get it through to him that i rlly do love him n i rlly dnt wna live without him. plz just help me its come to the point to where i actually have tried to kill myself n i was disappointed when it didnt work :(