Another welcome here for you Jswillis. It does sound like you are one of this club . . . not a club anyone really wants admission.
My qualifier did finally figure out sobriety but I had left long ago so I can't answer your question about trusting a newly sober partner. There are a few here who have partners who got sober but I'm afraid to say they are a bit rare on this forum.
Kudos to you for putting some money aside. There is a saying: "Hope is not a plan." It sounds like you already know this.
Big hug.