Struggling with Addiction

I need some thoughts, opinions, advice. Whether it be drug, alcohol, porn, etc. addiction is so hard to overcome, especially if it's been rooted for a really long time. & it's so hard to watch love ones struggle through it. I personally struggle from depression, but I'm posting because of my husband. He's been a porn addict since he was 14. He's done well with his addiction, but he does slip from time to time. I love him no matter what, but some times it's hard. I just want to know if anyone has any tips or advice on how to help or even just some words of support or encouragement would be great.