Disk,
I know how devastating relapse is, it leaves you empty, confused, frustrated, rejected, sad, and lonely and a bunch of other emotions all going up and down and all over the place like a roller coaster ride.
My own personal experience with loving someone who has addiction issues has been, relapse has unfortunately become his norm these last few years. I didn’t really figure that out until lately. He cycle became - that he would be great working a program and remaining sober/clean for 6, 7 or 8 months then bam a relapse. Each relapse was worse, he’d deteriorate at a faster rate, where 3 years ago it would have taken several months of using drugs before I could tell he was using again. This last one it was only a matter of him being on pain pills for a few weeks before his mind became consumed with his addictions.
If your instincts are telling you something, please listen carefully and proceed with caution, no matter what you decide.