If he thinks about it, losing his job is no big deal, he's probably spending all his money on dope anyway.
If he really wanted to stop he would put that first in his life and actually "do" something about it. Sadly, that's rarely the case, they would prefer that we think they have stopped..or will stop next week...or will stop when ___ happens..but it's all words until they take positive action to stop.
What you need to decide dear, is how long you want to live like this. You can't stop him, you can't save him and you are not the solution to his problem...but you can be the solution to your own.
Would you not rather have healthy relationships with your friends and feel healthy yourself instead of living in the darkness of his addiction?
You can if you want to...but what I suggested for him applies to you...first you have to take some positive action to get yourself distanced from all this instead of living under the shadow of his addiction.
You can do it and if you do, you will be okay and happy again one day soon. I promise.
Hugs