DS still lives with us, works full time and brings home around £450 on an average week. We had problems with him aged 17-18, hanging round with the wrong crowd (one of them has just been sent to a young offenders jail), wrote off the car we'd helped him buy, smoking weed. That all came to a head when one of the group arranged for a couple of others to assault him. There was no serious damage, just a bloody nose from being headbutted, but he stopped hanging round with them, made new friends from a hobby and we thought he'd turned a corner. He has a new car which is on finance because bank of mum and dad is firmly closed, and is paying all the costs for that which aren't a great deal every month because he'd managed to save quite a bit to pay a lot of it upfront. While he was saving we didn't expect him to pay us board but will be expecting him to do so from now on.
I've noticed since January that despite him having several hundred pounds (at least) spare every month he never buys any new clothes or "stuff" for himself. When I ask him about just about anything he's always really vague. Anyway, not to make this even longer and I know I'm going to get flamed but I checked his bank account yesterday. Because of mild learning difficulties I was the one who set up his online banking etc. a couple of years ago and he hasn't changed the login details for anything since. There's loads of debit card payments to pubs, clubs, fast food, petrol etc. but also cash withdrawals of at least £100 per week. He's got absolutely nothing to show for it and I'm thinking drugs. On top of wasting his wages he also had a £1000 inheritance at the beginning of March which has also gone.
Does anyone have any advice on approaching him and opening up a discussion without pushing him away? I feel sick thinking about the amount of cash that's just disappeared over the last few months. I feel sicker at the thought of where this could lead.