Please help was I wrong? Be honest

I wanted some insight in a situation. So in the past when me and my husband didnt have a car she would lend us her car and only ask to use it if she needed to go to the market and bring it back. Yes it was her car but she has a big hard she felt we needed it more than her. Now the roles have changed and unfortunately my mother lost her car and i now have a vehicle and my name but me and my husband share the responsibilities on. So i normally drive her around to do errands but today i became ill so i handed over the car keys to her. My mom respects me our car and isnt reckless. By the way she had our daughter so i could rest. She wanted to go to church less than 10 mins away. i live 10 mins from my mom. she also took my daughter to the store for a birthday gift because justice gave her a coupon since its my daughter bday month thats 15 mins away and thwy came back. Now i put gas in the car yesterday and my mom wpuldnt have burned much gas this wonderful woman filled my tank and handed me back my keys. I said she didnt have to but she felt it was only right. Now after my husband got of work i was honest and he became upset with me for letting her use the car and said u dont lend ur car to no one. I was comfused because my mom let him drive her car. My mom helps with out daughter financially my mom helps us financial. Was I wrong for helping ny mother who helps us? Or he an ass?

Thanks