Need advice

Me and my husband got Into it because when he was on the phone with his sister he had her on speaker phone and then his sister mentioned his ex to him and he hurried up and turned speaker phone off and walked away. So I went into our room and shut the door. Then we started arguing when he came back into the room because I asked him why he did that and if he was hiding anything. He threw his ring at me and told me after he gets off in the morning he'll have the divorce papers ready. Did I do something wrong? I'm so lost right now it's not even funny