Respect
What do you think a couple should do in order to live together closely and lovely without any unhappy things? RESPECT to each other will be the ONLY answer.
Tonight, I met one friend that we shared our experience. After that I proved once again only respecting to each other, copule then can keep together: no matter you are a boy or girl, you also need to respect to your partner.
I suddenly see that there is a shadow of mine. Quite terrible. So, I will treasure what I have now. No matter how different you two values are, if you two respect to one another, try to understand the other side; think bi-directionally; and don't be so anrgy easily, then you two will be more happy. Don't think only for yourself, otherwise you will not be LOVELY anymore and gap will enlarge poco a poco, tragedy will be resulted.