Should I stand by him & help him thru this or should I step aside & let him battle this out for himself?
Learn the 3 C's- I didn't cause the addiction, I can't control it and I can't cure it. He must battle it out for himself.
The only one I can change is ME. Read everything you can on addiction and codependency and attend naranon or alanon meetings. Focus on YOU, work on changing YOU and take care of YOU, YOU are worth it! You are not alone. Keep coming back.