relationship advice

My so and I have been together for two years. We love each other more than anything and we don't have any issues showing it to each other. Our main issue is communication. It seems like lately, everything I say sets him off or makes his blood rise. We've talked about it and we don't know where the root of the problem is nor how to fix it. We both get very heated easily and want to make this work badly. What do you guys do in your relationship to help communicate more effectively? How often do you argue?