My Boyfriend and I have hit a rough patch

So my boyfriend and I have almost been dating for two years. I'm one of those girls that around her period gets super super horny. He doesnt under stand that. I was trying to explain it to him but he wouldn't listen. Then he told me it wasn't an excuse to want to have a little fun if you know what I mean. I need help to get him to understand. HELP ME PLEASE!!!!!