You are right, the push/pull could have happened regardless of how I handled things. After weeks of silence, once I caught up to him, it was like there was nothing I could say for him to be open with me, everything was triggering at that point. The only thing I could have done is given it space but I didn't understand what was going on.
It also could be, as some BPD do, leave you before you can leave them, to avoid hurt. It was just so complicated and confusing it's hard to know if that was the case. When I caught up with him, it's almost as if he didn't realize how long it had been, (a month), and he was acting like he would have gotten back to me but how I was being too pushy, yelling "you called ME 5 times, if you call once, i will get back to you, your call and txt shut me down, to be honest!" He wasn't being logical because, those call was only two times, and my messages were in a span of a month of wondering where he was. He wasn't being empathetic at all. Something was definitely going on with him internally.
Or maybe it's how they say, once a person with bPD gets close to some, that person becomes a trigger. Once they get close, they can't handle it. But I hear about people having 5plus year marriages with those who have bPD with many break ups in between. I only had known him for a year and a half and we barely got into the relationship, that's why I wondered if it was really the end, and if the ideal image had been destroyed already that it will be never the same, when we were still pretty early in the stages. That's why I wondered, if I send that apology, if he happens to be in a better mood at some point, if we can go back or just start over (with better coping). I just have concerns about getting caught up in instability and dealing with more blowups and him taking the apology as "she has no boundaries" and losing myself all over again. But, i'd like to think there is still a chance to talk this through at some point, I just want to be realistic about it.