You need to cut him off entirely. If you keep poking the wound, it'll never heal.
Delete his number. Throw away or hide somewhere inaccessible anything that is his/he bought/strongly reminds you of him. Use a distraction technique to stop yourself thinking about him.
It will be hard, but this is the only way forward. At the moment, you're just denying the feelings whilst sober, and it all pours out when you're drunk. You're not deceiving yourself or your friends in either state, so it's a lot of wasted effort, and it's not helping you heal!
It will be really hard, it always is when you lose someone you love. You have to go through the pain and anger and acceptance stages, though, if you postpone them you end up months down the line and no further forward. It'll be a difficult slog to actively stop yourself thinking about him, but one day, you'll realise that you've gone all morning without thinking about him, or all day, and sooner or later, you won't realise that you haven't thought about him that day because he just won't be ingrained anymore.
Then you'll be a in a place to go and meet other people - right now, nobody will compare to him and you'll be disappointed and frustrated. You're in no place to be dating anyone else until you're over him - at that stage, it'll do you good to meet other people but it will also be much more enjoyable.
Good luck.