Am I borderline Personality disorder?!

I go obsessive and compulsive in a very sick and twisted way with this guy that I have been seeing for the last 2 months. He initiated the contact and we fell hard for each other soon. My problem has been the fact that I felt like he was changing his mind about me fast ever since we argued a few times and he decided my behavior during arguments was sometimes irrational and codependent. And I have intense fear of losing somebody through break-up and I panic. Lately, He seemed not as into me as before, more distant, and just not putting any effort in anymore. So I badger him constantly for being this way. Not only that, I will get angry at him for not responding to my texts in time, which eventually lead to pessimistic and excessive text messages that conveys how much he is treating me bad and I was an idiot to fall for him. What is worse is that I will totally change my attitude as soon as he responds back by accepting my pessimistic ideology and calls for a break-up. This prompts my non-stop aggravating attempts to talk him out of thinking of break-up. Relentless apologies after a hundred excuses and reasons behind my pessimism...I certainly see this behavior abnormal. I don't know what it is. We took a break for a while( he called for a break) but then He came back to me saying that he couldn't say no to me and that he missed me, wanted me, and couldn't stop thinking about me, but couldn't deal with my erratic behavior. Now He is calling it quit permanently after I sent him another 5 text messages full of pessimistic remarks about how he doesn't give a **** and calling him liar because he didn't respond to my 1st text message in time.. Please help. I am concerned of not being able to see this guy for good, but moreover I am worried that my problem is bigger than being just insecure with boyfriend.
I have been depressed before. I am emotionally labile, somewhat unstable, and I get easily distraught which sometimes cause me to think of drastic measures such as suicide and violence. I think I behave pretty normal although I had difficulty keeping jobs, it is always the romantic relationship that brings out my emotional problem.