Treat you relationship like your house. Build on a firm foundation. Pay your dues. Keep your grass cut so you can see the snakes. Lock your doors to keep strangers out. And always bring something to the table.
People put too much emphasis on toughing it out and putting up with all the bull. A relationship shouldn't be a fight. It shouldn't be a struggle. If both people are actually committed to one another, it's not hard at all.