Approachability

I spend most of my time in 'Lived Experience' but feel I might be able to write something useful here.

I've read a few stories about the impact drugs can have on a relationship - I've also watched my friends and also myself suffer because of substance abuse.

In my opinion a relationship should have a strong foundation built on friendship and acceptance - sadly I think I may be the only one?
Most of the time, if drugs and substance abuse start to affect a relationship, it's too little too late.

If you truly love a person, you accept the responsibility of being there for them through all life's challenges - drugs included.
Your job as a partner is to be there for your other half and carry burdens together (within reason).

If your loved one doesn't feel they can rely on you to not only to listen and care, but to remain unjudgemental and strong - they will stay silent...
If they do confide in you, don't freak out straight up cause you'll only make them regret being honest - which will make them hide what they're doing.
Be open and ask questions (why are they using; how often; with who etc.); listen and try to see in from a different perspective; establish boundaries and take some time for yourself to process everything.

Don't try to be a psychologist. Don't think you know better after reading countless pages of mediocre FAQs. Don't give them an ultimatum. Don't betray their confidence and trust by telling friends and family.

But all that being said - you cannot change a person no matter how much you love them and you yourself should never settle for less. At least you tried...