Anyways, do you know her? Did you break her heart or something?

Neyse, onu tanıyor musun ? Onun kalbini falan kırdın mı ?

She will not give me any information, and I stopped talking to her and removed her from my friends list.

Bana herhangi bir bilgi vermiyordu. Ben de onunla konuşmayı kestim ve arkadaş listemden sildim onu.

I just wanted to let you know. It is very strange and I´m not sure what to do...

Sana haber vermek istedim. Çok garip bir şey ve ne yapmam gerektiği konusunda emin değilim..

Anyways, I miss you so much, think about you every single day and I hope we can talk soon on Skype!

Neyse, Seni o kadar çok özledim ki  her gün seni düşünüyorum. Umarım yakında Skype´ta konuşuruz !

Besides, if someone would bother to explain the syntactic use of gerek and gerekmek more widely I guess it would be useful. It often confuses  -  me at least.

Let me try:

ne  yap-ma-m  gerek- tik-i  konu-su-n-da  emin  değil-im

i is possesive suffix

I am not sure about emin olmak has to always take ablative.

And what brings it there?

(benim) ne yapmam gerektiği konusunda (this is a noun phrase)

im is a connection suffix and it needs partners which have possesive suffixes.

, 

I edited my post. Now it seems okay.

It is fatal for understanding to stare at individual words instead of whole phrases. It sometimes happens to me. But what confused me was that I couldn´t see the ablative anywhere. I found an example which is a little bit similar:

         Hangi teslimat tarihlerini seçmem gerektiğinden emin değilim.

When I made my syntax courses in the faculty (a little bit after Prophet Noah finished building his arch) we never analysed sentences linearly. We wrote the words in a pile, one word in a line like

         Hangi

         teslimat

         tarihlerini

         seçmem etc.

It was easy to mark the phrases and how they were connected to each other. Sometimes I feel like doing the same with Turkish sentences now. Colours can express the same thing maybe but it is still not the same for me.