How to avoid arguments or argue in a more healthy fashion

I am new to this site. I have read lots of comments about the non ADHD partner getting negative and angry but in my case it is my ADHD partner who gets angry - does anyone have top tips for dealing with this and arguing healthily - most of the time my partner is calm and loving but at some point every few days there is a row - I feel I can not win - I try to be quiet and avoid confrontations but don't want to loose me-he says he wants to know my honest view but if I don't agree he gets cross and if I do agree he says I need to be honest. It is like I am going out with two people - a caring delightful man and an angry aggressive one! What strategies can I use when he is in angry mode?