Also you don't know how long he has had the bottles. We have a collection of bottles and cans for recycling every other week. I always forget to put mine out in time so by the time I do remember, I have so many I look like a complete alcoholic compared to the rest of the street!
I only drink 1 bottle of wine per week plus maybe some cans if mates come back to mine after the pub on a Friday night!
Give him a chance, maybe he does have a drink problem but you can find that out yourself, don't believe rumours that may not be true. It could have been started by someone who saw him at the bottle depot with loads of empties.
To be honest, if someone I fancied saw mw at the bottle bank with all my bottles as described above ^^^^, I'd be really embarrassed and try to get away ASAP!!