bana inanmiyorsun ama benimle arkadas kal en gec 3 hafta sonra eski (name) olursun. Guven bana seni kazanmak ve hatam varsa yardim etmek istiyorum. Bu konu da inanmani rica ediyorum! Son cumlemi iyi dusun lutfen.

 You don´t believe me, but if you stay friends with me, you will become the ex  (name) in max. 3 weeks.  Trust me, I want to win your heart and I would like to help you if I have any mistakes.  I am requesting you to believe in me.  Please think thoroughly about my last sentence.

cok tesekkurler merih, but what do you mean " I would like to help you if I have any mistakes"? I don´t understand that part

 Me neither.. but that is what it says in Turkish.. maybe a word is missing, or just wrote a wrong word.. I guess