I don't think that's always the case. Some of his closest friends who also became drug addicts were friends he had since he was a toddler and before none of them used drugged. He tried helping two of them quit, but eventually realized they were not ready and he had to keep them out of his life. He still misses them and wishes that was not the case, but he knows better now. I do think people's brain gets rewired in a way that their addiction is a very strong need, and satisfying that need comes first, but at the same time I disagree that addicts don't care about others human beings. I used to do drugs when I was younger, I never had an addiction problem, but I've been around a lot of addicts. There's been some shitty people and there's been some great people, even now that my life is very different than theirs. Some have gotten better, others haven't. I would still count some of these people as some of my best friends and I've counted on them many times throughout my life. I think there's a difference between people you party with and all you have in common with is drugs and just people you're friends with who also happen to do drugs. My 4 closest friends are all people who have struggled with addiction, all of them are better now, but even when they weren't, it wasn't like they were constantly trying to push me into doing drugs with them or asking me for money or anything. Maybe I've just been lucky to get close to people who are very self-aware. I find the occasional regular non addict to be way more annoying with their "C'mon just have one beer, why can you have a drink? Can't you have fun?" or the people who don't accept that you no longer certain things and pester you with "just try a little bit, it's not gonna kill you". People like the people around them to do what they do, when you're an addict it's not easy to say no. I think it's as simple as that.

Also when my husband and I started our relationship I was aware he was a drug addict, I always pushed for his recovery. I even told his family, who had no idea and I was never once treated as an enemy. I can't say he's ever once even been angry at me for me trying to get him help. I thought he would be when I told his family, but he understood that I was thinking of his well being and he thanks me everyday for staying by his side while he got better.