I cant believe you was on the streets before you even did drugs.
But your friend did good helping you
Im in the same situation as you but im lapsing every couple of week. You have already been clean a year in the past . So i wouldnt beat myself up about it, and just get back on track. And do what you did last time to stop.
But u need not go out with anyone that does coke. And delete all your dealers numbers. Go back to some meetings again.