I can't stop telling you that

Is this correct (I have actually no idea) but this is my try: bu seni soylemeyi duramam

Thank you Kemal.

Will my line be understood? Because I already send that yesterday

I think they understand.
If you wrote "bunu sana ...", they would understand easily what you mean.

Oke, well they know that I am learning, so they understand that I make mistakes. But I don't want to say strange things