Though this can occur in many people when they are having a hypomanic or full blown manic episode, gambling and spending addiction(s) are not necessarily confined to those with Bipolar disorder.
In other words, one doesn't have to be Bipolar to have these addictions, just about anyone can fall into such addictions.
I know several people who are gambling addicts, and a couple who together were so hooked, they lost nearly everything they owned.
When they were on a winning streak(s) they had bought 2 vacation homes, had terrific cars, a boat, etc. besides being sucessful with their family owned banquet restaurant,which they also lost.
Now they still have there home, they had to do a reverse mortgage in order to survive. Both are in their late 70's and at one time had it all, now just reduced to their little home,poor health and crappy car(s).
My point is neither one is Bipolar.
I'm not saying having Bipolar disorder can't fuel spending sprees,gambling,drinking and any other addictions, but one doesn't have to be Bipolar to have these behaviours.
There are various treatment plans and/or support groups that may help a person with these addictions.
A Pdoc or therapist can direct you to an organization in your area or neighboring county, if you are looking for help with this and want to help save your relationship.
It also helps when a spouse/partner gets involved in order to help and understand what's happening or causing this, which in turn can benefit both.
I wish you lots of luck with this.
Take care,
DE