Pisces men; Oh how I love them and oh how they drive me nuts! Advice please!!?

To make a really long story short.. Since I was 14 (I am now 23) I have had a rollercoaster on and off relationship with a pisces male (he was that insanely cute guy who all the girls loved in highschool. Including me) Even before then, when I was in middle school, he would tell my sister, "im going to marry your sister one day". It started that young. Oh how i wish i knew the drama that lay ahead.

During the first 6-7ish years it was never official and he would always come in my life and out just as quick. And as you know with a pisces their words will make you melt when they come back, and you so much want to believe the sweet things they say and promise. During those long, hard, emotional, and PAINFUL years he had done some pretty wrong things to me. Now I am not one to make excuses. I still dont think any of it was right. But I do deep down know he never wanted to hurt me. He plays the martyr real well. He didnt have a great up bringing nor did he have great influences. He has always been the type to give his shirt off his back, but at the same time was very harmful to himself (becuase of his escapes with his emotions). Anywhoo, about 2 years ago we finally made it official and were together for a little over a year. By this point, everyone, including my family had given up hope on us becuase of all the past years, the pain, and the long histroy have had together. But by this point he had grown up a lot but still had a lot more. After about a year of dealing with his legal nonsense and not getting the treatment I deserved (he wasnt even going to take me to his best friends wedding!! His excuses was his best friend got the groomsmen a cabin to all stay in; its out of state; and he didnt know where i would stay), i fell out of love with him and left him. He of course was heartbroken and went nuts! His mom later told me he had a really hard time getting over it all. We both did..

Well now almost a year later after breaking up, we started hanging out again and of course, BOOM! I fall right back in love. He had tried many times while we were broken up to get me back saying the amazing sweet things but I stayed strong and didnt go back. I dont know why, but this time I did. His brother told me the whole ride home (which he left where he was out of town just to see me that night) pisces wouldnt stop talking about me and said he wants to spend the rest of his life with me. And that he didnt want to pressure me back into the relationship but how he really wants it to work. The brother also told me he would drop anything for me. Wellll anyways one of our biggest problems when we dated a year ago was the fact that i couldnt let go of the past and the hurt he did me. It didnt feel right to just write it all off. This problem arised again this time and i started picking pointless fights with him a few days ago and saying pretty mean things that made him really mad. LIke telling him how he should treat me and ttelling him he doesnt really love me for me. I also compared him to my sisters boyfriend which was so wrong. I know. He called me the next day after trying to make the relationship happen again for days, and said he finally has decided hes not the guy for me and will not ever be able to make me happy. He said he is simly just not the kind of guy that tends to a girl all the time. Ugh like thats what i really wanted. I dont know where he got that idea anyways..I was distraught. He seemed so ok with saying this to me. Then to come find out he went back to a girl he dated when we broke up. Nothign serious. But he hung out with her and was so ready to give up trying to work things out becuase he had this other girl. The point of this whole long story and post is, does he really love ME or just the idea of me. We come from two different worlds. I have had a great upbringing and have high expectations in relatinoships and he knows i would love him, take care of him, and be as loyal as they come to him! Can a relationship work with this much baggage and history. There is no doubt we love eachother and there is no doubt i will EVER love anyone the way i love him. I so wish we could work but i dont know truly and sincerely if he loves me or the idea of me. I really just need someones opinion on a few questions:

Has he kept coming back to me all these years (8years) becuase of how much I love him and he knows I will be here for him and love him.

Am i really his one and only but he turns to other girls when things get bad with us and i let him down?

Does he really love me and want to be with me, or just the idea of me?

I know these sound silly but I just cant understand him sometimes. I have venus in pisces so i love to a T like a pisces. That is how i so much can relate to him sometimes...