Help !!! Low sperm count after a baby 😔💔

So after a year and a half trying I decided to try the sperm fertility check on my husband just cause. I was sure I was the one with the problem all along, and also because he has a 3 year old already. Well the test came back as LOW, only one line came back and now I’m more confused than ever.

So that means I’m ok? I’ve done opk and ultrasounds and they all are good and extra positive.

Is low sperm count reversible? What can I buy for him?

On top of all that his in denial, he didn’t want to talk about it yesterday and this morning I was like hey don’t worry this can be reversible we just have to stop drinking and smoking and hes like oh I’m not worried, I know I’m ok I have (he said the name of his son) already so and I was like yeah but the sperm can change we just have to do this and that and he was like yeah yeah. I also told him that we should go to the doctor to see what he recommended and he no. I’m worried that his not taking this seriously and I want to be supportive because el was all this time when I thought it was me but I don’t know what to do😔