I married my husband nearly 17 yrs ago and he was and addict then although I was young and naive and didn't realise then. I thought it he was young and would settle down.
5 weeks ago he walked out to be on his own and drink. He has battled his addiction this whole time, even before I met him. I have supported him and stood by him. I love him deeply and miss him and yes I will continue to support him if he decides recovery is what he wants!
If you have any doubts think long and hard it's good he's seeking help but he needs to show you he is serious
Good luck and hugs