Difficult saying here.
I've been emotionally flat since childhood, but also had a dysfunctional upbringing. Abandonment may have been an issue, but to be honest, I can't imagine wanting to be with anyone.
I've also had a multitude of individuals come and go throughout life, but none of them have meant more than the other, or have left any lasting impressions aside from immediate family. Even then, I can't say they're all that impactful. So, I was either born like this, or had a childhood so severe that I severed myself from my emotions. I find the latter difficult to believe given I remember nothing of the sort, and find the former far more plausible.
At the end of the day, it's rather irrelevant. I'm still me. I still prefer solitude, privacy, independence and autonomy. My inability to bond still causes me no end of troubles interpersonally. And I'm still unsure where I'm going with all this.