Is it wrong for me to tell my husband this?

Sometimes my husaband gets on my nerves and does things just to irk me. And when he does this I tell him, "I wish I had someone else who don't (what ever he does) like you." And he stops and leaves me alone. Now, he is begining to think that I am cheating on him ( I am pregnant who am I going to cheat with) and calling me a b i tch or a and I aks him why does he do this and he says that I am acting like a . And married women shouldn't say this to thier husbands. Why shouldn't I say how I feel? What do you think?