My husbands says that he is numb, what does that mean?

my husband accuses me of cheating almost every other day,and I personally don't go anywhere but to work, every where else I go is with him, and last week, there was a situation where the guy from RAC called my phone and I didn't know the number so I told my husband to call it back, and he got the vm so after that my husband text the # from and the man told my husband that i didn't want him and he should go away My husband now is behaving differently