Hoping, you wrote,
"We were engaged for a year and were planning our wedding when he relapsed, not once, not twice, but five times. I only wish I had not gotten engaged to him - By getting engaged I got my family and friends involved in this. They were as excited about our wedding as me, if not more."
This is EXACTLY what happened to me. I clearly remember voicing my concern that I had a bad feeling about marrying her with my best man a week before the wedding, and him saying it was just normal to feel that way.
Oh, how I wish I had not let the pressure of the family, etc. push me toward the alter. To think you're heading this advice makes me feel better... to have helped even one person not make the same life-changing mistake I did. Good luck, and stay strong. Don't let friends or family guilt you into a bad decision that will haunt you.
Peace