What can I say to my husband?

I had a very bad fight with my sister and took it out on my husband. There’s no doubt I acted like a bitch. I feel my husband always overreacts to the situations. We are separated for a few days because I’m babysitting my grandchildren. Just now on the phone he gave me a long-winded speech about how hurt he is. He wants to know if we can move on. That’s code for we need to work this out or we are going to get a divorce. Every time we have a fight he thinks were going to get a divorce. I did tell him it was overreacting and that just made things worse. He wants me to think about it for a few days and then get back to him and let him know whether or not we can work through this and move on. I truly don’t know what to say to him. I think he’s ridiculously over reacting. I can’t say that or I really will make things worse. I really don’t know what he wants me to apologize for or even if he wants an apology. Being in a shitty mood because you had a fight with your sister to me is a normal reaction.. But apparently not to him. Do you have any advice on what I can say to him that will satisfy him so we can“ move on“. To suggest we’re going to get a divorce over the situation is the height of silliness.