goster buyuklugunu gitme ustune o seni gercekten seviyor. ben yada x bir insan biz bugun variz yarin yokuz ama siz kardesten otesiniz. kendine iyi bak abi

My try for the first bit:

Göster büyüklüðünü gitme üstüne o seni gerçekten seviyor.

Show your generosity, don´t confront, he/she really loves you.

Ben ya da x bir insan biz bugün varýz yarýn yokuz ama siz kardeþten ötesiniz.

I or person x, we are there today, tomorrow we´re not, but you oppose (are on the other side from) your brother/sister.

Kendine iyi bak abi

Look after yourself (take care), brother.

and my try for one more line:

Abi diyorum sana ve kesinlikle abilik gördüðüm içindir.

Brother, I am saying to you and with certainty (to the brotherhood?),

it is for what I have seen.

Abi diyorum sana ve kesinlikle abilik gördüðüm içindir

I say (older) brother to you, because i really see it as brotherhood.

I tried to translate but needs some improvements because I gat the help of dictionary and I am not very sure if the words are really used in daily life.

goster buyuklugunu gitme ustune o seni gercekten seviyor. ben yada x bir insan biz bugun variz yarin yokuz ama siz kardesten otesiniz. kendine iyi bak abi

Show your virtuousness  do not fall upon her/him.  me or person x exist today but not tomorrow. but you are more than brother-sister/brtoher-brother. Take care.

Show your generosity and be tolerant to him as he really loves you so. No matter who (the first), I or person x, (we all) will leave the world when our time comes but (what’s rest is friendship and) you are closer than siblings. Take good care of yourself, brother.

I call you brother just because you’ve always acted as a brother to me. Firstly, I didn’t say that (you) had bothered me, well you did once, while passing me here, and I had told you that on the day we met first, but it was so normal as you had done that to me before you knew me. Secondly, Serdar is so confused as I am moving to another city because of the problems between us, but as he doesn’t want me to move, he is attacking on me. I was upset when Claudia added you (to her friend list) and I was complaining to a mutual friend, saying, “Claudia is everywhere! Why the hell she added brother Volkan!” Claudia phoned him (mutual friend) and told that it was Volkan who wanted to add her first. I was upset because I thought she had been the first. I was upset because I had told you all about what we had (together with her? this part is not clear), and if I ever think someone as my brother,soul, I never change my mind about him. As for Serdar, he is now really very confused, but you two should not break the friendship of long years not because of me, nor someone else.You are not only friends, but siblings. And elders should forgive their young. You’re my brother.

Thanks everyone