Hello Haybelly, Welcome to SR!
You have found a great place for information and support!
My xhusband divorced me--and once I came to terms with it and decided it was for the best as well (he was cheating on me), I still felt guilty.
It's a natural emotion to go through. Could I have tried harder, could I have done more? The answer I came up with for myself is "NO". I did everything I could.
No one here can tell you whether or not to end your marriage. You may not be ready to take action now or ever, but it does sound as if you need a little breathing room. If finances allow, perhaps the two of you could live separately to allow you room to think without pressure and to decompress, and to allow him to pursue his recovery (or lack thereof).
Please make yourself at home and continue to read around the forums. The "stickies" at the top of each forum contain a lot of valuable, basic information about addiction and recovery.
Welcome, again! HG