Marriage. Some need to remember what it is all about. You don't give up when times get tough. When you choose to marry someone you are choosing to spend the rest of your life with them through the good and the bad, the easy and the hard times. You stand by that choice, and that person, no matter how hard it is, every single day.
Yes. It's about seeing that person in their darkest time yet still choosing to love them. That is love. No relationship is perfect. There will be fights and dark times. But when you truly love someone you work through it.