Questioning and Honesty

"whyd you break up with him", i hear from the other side of the line. It was my friend Sam, my ex-girlfriends bestfriend. It was a question i've been asking myself for the past 5 days. I guess the asked because i was being so sweet (i tend to get that alit from girls). But just hearing thise words and knowing the answer was coming was something i was not expecting to ever hear. I couldn't see her but i knew my ex turned around to her really thinking ans said, "i didn't want to go drinking and cutting and doing drugs behind his back."
I was sure what i was supposed to do. Was i supposed to thank her? Or just leave it be and act like it was never said. I chose the second one. There was a million things i wanted to say, but i knew i couldn't say any of them. I wanted to tell her i would have been fine with it andi wouldnt have broken up with her if she just told me n the first place, which was some what of a lie. I wouldnt have broken up with her but i deffinatly wouldnt have been fine with it. I wanted to tell her how much i love her and that i wanted her back, that i would do anything to have her back, but i knew i couldn't, i knew that this was the way it was supposed to be. I knew from the begining that our relationship wasn't going to last but after we broke up i started to think other wise. Bad timing on that one... But i wonder "what if we did get back together? Would we work out? If what she said is true and the only reason she broke up with me was because she didnt want to do all those things behind my back then it might just work out if she's honest with me, or at least can make me believe she's not lieing to me."
I realized at the worst time how much i actually cared for her. I would honestly do anything to make that girl happy. I feel like i hold a special place in her heart but i'm not sure. There's just something about our 3-4 hour conversations we have every night and how when we hang up youll call me back 20 minutes later and tell me you miss me that just tells me i'm not just another ex-boyfriend of yours, and God i hope i'm right.
In short, i really miss that girl, and i'll do anything to get her back, but if she's happier without me then i guess i'll just have to let her go.