Drugs do bad things to good people... I also had a friend simillar to him, he used his friends for everything, used and abused us to get money, to get a home, to get everything, in the end when we realized how toxic he was we had to let him go, he went away for a while changed city and got his life back on track, after that he came back and tried to reconnect with us, he allowed him a little bit to reconnect with us, but he made the mistake of coming back to the city where his mom lived... his drugs problems were all connected to his mom, also a drug addict, he lived in my city for 5 more months before having a OD and dying...

Don't know where i'm going with this just wanted to share that trusting wrong people is normal, even if we are carefull we are not always 100% right, so sooner or later we will trust in someone that we shouldn't!