Subject of the second part of the sentence is you. And dont forget to make a literal translation.

Sana benim seni sevmediğimi düşündüren davranışlarımın nedenlerini sorgularken sanki sen beni benden daha iyi tanıyormuşsun gibi bir tavır takınma.  

Don’t assume such attitude as if you knew me better than myself  when investigating the reasons of my behavior that made you think I wasn´t in love with you.

şimdi şaşırdım galiba

 Good translation. Did you get help?

Henry´s method is my only help.... I certify

 Good. Was it very difficult for you to translate?

Thank you Gokuyum, it was really a good exercise

I hope you learned new things.

At the beginning I thought I will never do it, then little by little, with your corrections it became easier.

Thank you tekrar!

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Anyways you did a good job. Keep going.