Seni öyle bir sevmişim ki
Bi kurşun sıksan kafama yine de vazgeçmem senden asla!

My try as learner:

Seni öyle bir sevmişim ki

I´m said to love you so much. (I think this is inferential mode because of "miş" ending - although I´m not sure about it, I don´t know what can be role of "bir" before "sevmiş" which I think is "sevmek" put in past inferential tense).

Bi kurşun sıksan kafama yine de vazgeçmem senden asla!

Even if you fired a bullet right into my head, still I wouldn´t abandon you.