Been married 25 years to a stutterer. He did mention he had a childhood stutter which wasn’t exactly the truth because he had a full on block which I wasn’t prepared for when we were dating. Best advice is just act like he doesn’t have a stutter and wait for him to finish. Don’t finish his sentences and just let him take his time to get it out. Stuttering doesn’t devalue him/her in any way. It’s just a disruption in flow in his communication style. Doesn’t affect our relationship one bit.