I'm sorry that this happened to you, it's tough to get through.
Take a look at what you said;
"Why do I get treated like this for doing nothing wrong but dropping out of college, moving, givign up all my friends, family, job, money and credit"
It may be that since you were giving, and giving, and giving he figured that you would keep on giving. Didn't you say you took him back more than once?
This is not saying he is right. He's a dog and took advantage of your nature to nurture and be there for him.
When the hurt has lessened think about seeing a counselor, whether it's a minister or medical professional and work out how 1) you can spot these cads in the future, 2) what you can do to lay out up-front what you expect from the relationship, and 3) how to leave yourself exit points [getting out before it gets you] so that you have some peace of mind in future relationships.
It wasn't a good match and you're the one who's suffering for all that. You need someone who appreciates and cherishes you for who you are.
With a little care in the future I'm confident you will find that person.