Patience and understanding

My fiancée has a difficult time being patient and understanding toward me. He becomes frustrated with me when I am irritated. He will do things that annoy me to make me even more angry, and when I explain to him that at times I just need comprehension and support, he says that it is difficult for him to do that for me. He says that he loves me but he cannot handle me being irritated or moody because he will get the same way, even if the reason why I am upset was not due to an altercation between him and I. It has affected my relationship with him. How can I make him be supportive and understanding when I am not at my best?

You can't MAKE him be supportive and understanding. If he loves you 100%, he would naturally support you...but whether he understands this is another thing. If he does things to annoy you even further when you are upset etc then he's demonstrating some very immature behavior towards you. Couples need to communicate with each other and true couples will turn to each other for support and advice and comfort each other when they know their partner is irritated, upset, had a bad day..whatever And if it's difficult for your fiancee to do this for you now, what will it be like down the track?....