There's nothing quite like the initial attraction and that wonderful loved up phase when you start a new relationship. But, there's also nothing like the feeling of enduring love, mutual respect and security that comes from being in a stable long-term relationship. When it comes to Valentine's day, however, you might find that many of the cards in the shop don't accurately sum up the kind of feelings you have for your partner! So, we've collected sixteen Valentine's cards that are perfect for couples who are in long-term relationships! Take a look and see if you can find the perfect card for your other half!