Alone, Welcome to SR. You will find a lot of support here.
I was in a long term relationship with an addict. I did not know until we were "together". He never changed. He never saw past his use and I went along for the ride until my own addictions matured and stood on their own.
I knew back then and allowed myself to continue with the idea I was being fulfilled when in fact I was not.
You seem to know you are not now and can articulate it very clearly. Why not listen what what you know already and make the tough choices now.
Once you are a pickle you cannot be a cucumber. He will be who he is and putting something like cocaine use "behind" him may not be possible.
Best of luck to you!