Giving him a chance to. . . . ?
Reflect on that.
If you think he will be able to put himself together enough to build a solid relationship with you in 2013, or should build a relationship with you in 2013, then you have not read enough books on the disease.
Yes, we all know that vortex of chaos that is inside us when we are affected by an addict.
Do not make any decisions right now that will have long-term consequences, okay? Step back, keep very minimal contact (many here will suggest you suspend all contact for awhile but you may not be able to do that), and get a counselor if you can afford one (to put the focus very much on your issues and not his) and place yourself in an Al-Anon meeting a couple times a week.
You are no match for his addiction and you are in a very fragile state right now. You need help where you are, help from sane people who understand your situation and state of mind. Do not go this alone because you will crumble. It is a powerful force, addiction. And his history is pretty shocking.