Welcome, Jlsteel. Glad you joined us.
The revolving door of breaking up/making up/relapse rinse and repeat ends when we say it does.
It hurts and it is sad to say goodbye to our hopes and dreams, in my case it was for my son. After years and years of trying to save him from addiction and from himself, I had to let go. Already I could see that half the insanity was mine, in trying to fix what was not mine to fix.
Only you can decide whether to stay or go or to stay gone... but the pain of leaving does heal in time, the pain of staying may grow far bigger than it is now if you choose to stay.
Good luck.