Offsetis breaking his silence on the death of Takeoff ... saying the pain he's left with after his cousin and groupmate's murder is "unbearable."
Offset took to Instagram Tuesday saying it "doesn't feel real" to be talking about his family member under such tragic circumstances, writing, "My heart is shattered and I have so many things to say, but I can't find the words" ... adding he's been waking up from his sleep recently, hoping it's just a dream -- but adds "it's reality, and reality feels like a nightmare."
He recalls all the times they'd see each other, wishing they could do so many things together just one more time ... writing, "You have left a hole in my heart that will never be filled."
As we reported, Cardi Bspoke out about the death of the 28-year-old rapper over the weekend ... saying to her late friend, "The impact you had in this world was so considerable and we have struggled to grasp this tragedy. I am heartbroken but I am grateful for all the precious memories we got to share while you were here with us."