The ex wife is getting on my nerves

My husband has a son with his ex, he is now driving and lives w/ her. He (husband ) carries car insurance on himseelf and the son , it expired. She (ex) has a way of butting in our lives, she hates me and makes it known, she has turned the son against me. Anyway, she called around got insurance quotes for the son and also my husband and he let her do it. She set everything up to where all he had to do was go by after wk and sign papers. It makes me upset and he says there is nothing wrong with this. I said he should have called me to do it for him. He says I am making a big deal out of it... AM I?