need help to understand a meth and alcohol addict?

my boyfriend has been using meth and drinking heavy.he will disappear every weekend,and he has lost a job and on the verg of losing another.he says he loves me and wants to quit,but then again he will leave and not come home.i dont know how meth addiction works and im not sure how alcohol addiction works eather.im trying to be understanding but it still hurts.is it normal for a persons attitude to change.he use to be some what nice to me and seemed sorry when he use to disappear,but now he seems more distant and cold when he is home.i told him we could seperate until he found out what he wants but he says no.i want to stand by his side and help him through this but at times im not sure he really loves me.is it just the addiction,or is it just him.please help me understand.if i new he cared and it was the drugs making him this way,id be able to stand by his side,but if its not i need to let go.please help.

More Meth Drug Addiction Info:

• New Job-Hunt Articles + Career Spotlight – Job Search News
• Canada Drug & Alcohol Addiction Treatment Residential Rehab
• The Significance Of Alcohol Rehabilitation And How Alcohol …
• The Importance Of Alcohol Rehabilitation And How Alcoholism And …
• Bodybuilding.coms – Tra.exe – Attitude
• Bodybuilding.coms – SLINGIT's BodyBlog – ATTITUDE
• Albert Einstein » Positive Personality and Attitude will take you …
• Job Board WordPress Theme For Job Listing Websites
• Hostile Attitude toward America's Veterans Using the VA is Nothing …
• War on Drugs program a colossal failure | SmallGovTimes.com