What makes a good marriage?

The other night Jon and i were talking about marriage, and what makes you happy in marriage. Jon had read an article that in a poll, it said that older men are more happy then women in general. I said that it didn't suprize me because typically speaking, women seem to be more discontent in life in general. Not all women, and not all the time. But if we are honest with oursleves, we've probably fallen into that catergory more then once. It always seems to me that for one men can get over disagreements with someone alot faster then women can. I admire that in men. In my personal experience, i can say that i feel more cut and hurt if something is said about me, or done to me, whereas my hubby will be upset for a few days, but can generally forgive and move on. So we were talking about that, and i said, you know if i just didn't hold on to hurts, and let more go, even in our marriage it would make it even that much more happier. Maybe i am way off, and everyone is different, but for me it was a new found moment for me. Right now in particular, we are going through a little trial, not on our marriage, but something we are dealing with together. It has made me a little edgy, and unfair. Last Saturday he had asked about something, and i just blew up. I felt so guilty inside for yelling, and so sad about it. But everything inside of me did not want to apologize. But i swallowed my pride and came to him and told him i was wrong and to forgive me. But i was still so mad at myself because i dont know why it's so hard to do these things. To swallow pride! Grrr on me!
Anyways, no marriage is perfect, and we all struggle in some area, but i guess we are all a work in progress right!
I was just wondering your thoughts and advice on what makes a good marriage.