I am glad you are seeing a therapist. Is it virtual?

I’d not necessarily call it an ultimatum because you didn’t tell verbatim what will happen. You said you’ll have a problem or something like that. He didn’t ask what you meant and you didn’t specify. So I’d not worry now that you must leave if he acts out again. On the other hand if you think he understood it as an ultimatum then it’s tricky. If he relapses and you don’t leave then he’ll know he can do pretty much anything and you’ll still be there. Ultimatums are tricky. I gave an ultimatum once and followed through but i think deep inside I was one foot out anyways and was pretty much giving myself a permission to leave. It makes decision making easier.

I’d run by a therapist and see what they think. They might even have ideas on how to approach your husband so he improves his behaviors