I just feel like I’m wasting precious time on him and I know that sounds terrible but it does feel that way
It doesn't OP. It sounds like you're finding your self respect and boundaries and will be making positive steps to extricate yourself from him and this life which is hurting you.
You know you can't trust him. He's already ruined his second chance. It's really hard but you know you can't trust these "friends" either. Are there friends which are only/mostly yours you can spend time with? People who look out for and care for you, rather than covering for their druggy mate?
You're tying yourself in knots and it must be exhausting and a big distraction from everything else in your life. A toxic relationship saps the life out of you, I empathise so much.
Can you picture life without him, skip over the break up bit in your head and imagine life on your own, in your own peaceful happy home, with time to do the things you enjoy, spending time with people who make you laugh and feel good about yourself, with energy to put your all into your own life, feeling optimistic about the future.
When I left my ex I did it terrified about everything, money, where I'd live, losing my friends, never meeting anyone else, everything! I slept on someone's sofa for a bit till I got my own (teeny tiny!) flat and I can't tell you the relief I felt waking up that first morning and knowing I never had to go back. It was like being set free. It also wasn't all easy getting used to living by myself but it was so much better than I'd expected. My sanctuary, my food in the fridge, a pretty duvet cover he'd never have let me buy, enjoying my own company. Change is always scary but sometimes it's the best thing to ever happen to you.