Honestly, I would be afraid that there might be other "surprises" in addition to that CC. I would certainly make marriage and family/couples counseling a requirement for staying in the marriage. I would also absolutely require that he sell whatever this $1000 item was and put the money toward paying off that card.
That's how I would react; however, as PP's have said, this is your relationship and only you can decide what your tipping point is.
And, FTR, I also have mood/psychological disorders that require medication, and I do have my depressive episodes and funks. That never gave me a free pass to mess up our finances. My DH is very empathetic to my issues and puts up with a lot, but he would never tolerate me messing around with our security.