The only reason he is sober right now is because he is in jail.
The best indicator of his future behavior is his past behavior. How long has he been sober on his own without rehab or jail as the reason for his sobriety?
You want to know if this is his bottom, is this his last time - but my question to you is this:
Is this your bottom? Have you had enough of the cheating, abuse, financial instability, lies, denials, baby-sitting, blame-shifting and manipulations?