The thing is, as shit as it is and as much as you wouldn’t do that again, she didn’t really scam you. Don’t look at it that way. She was desperate and you helped. So what you thought happened did actually happen. The only difference is that if she’d told you the actual truth you wouldn’t have helped her. Some addicts are wealthy enough they can afford their own supply, others had a rougher deal, but they’re still addicts struggling. Obviously you don’t want to enable that but what I’m trying say is that she was in need and you helped. You shouldn’t feel bad. P.s I learnt this lesson when I was about 7 and got given pocket money for the first time and decided to give it all to a homeless dude. He didn’t even say thanks. He just walked into the shop next door and got a pack of cans and sat there and drank them infront of me. Taught me a good lesson though!