We all know that couple who have been together for years and who we can't see breaking up. You're never able to see the one person without the other. They are the dynamic duo, each other's confidant and each other's best friend. You could possibly wonder how they can stand each other for that long, but they love it and you love seeing them happy. This list is about all of the things that happen when two love birds are together for a very, very long time.

1. You stop caring about what you look like.

They've seen you at your worst and if they still love you after you were such a mess, then you don't have to try to impress them anymore. The perk is that you can lounge around in sweats without showering and they will still cuddle you.

2. You become part of their family.

After dating for so long, you've met the family and you visit them regularly with your significant other. Soon, you are texting them like they are your own and you're invited to every single function that your significant other is invited to. Who doesn't like to have a second family that doubles as your cheering squad? If you're lucky enough, you'll make the family Christmas card.

3. Your friends wonder where your significant other is when you show up by yourself.

You casually wonder if your friends like your significant other more than you.

4. You become an amazing dynamic duo.

You're the best team to ever exist. Life is fun with them by your side.

5. Valentine's day is whatever.

You've spent a lot of Valentine's Days together and you've given countless gifts throughout your relationship. A home cooked dinner or even a sweet card will just about do it for you. The holiday becomes irrelevant when you show your love for each other on every day of the year, not just one.

6. You can be as weird as you want to be around them.

"Was that a weird thing to say? He probably thinks that I'm so strange." Two years later and you're sitting next to each other in your underwear while eating peanut butter out of the jar.

7. You feel betrayed when your significant other watches an episode of your favorite Netflix series without you.

You guys have binge watched Netflix instead of going out more times than you can count. So, when your boyfriend/girlfriend says, "I watched it without you," you feel a knot in your stomach. You what?

8. You start to think about your future with them.

It's a scary topic for anyone, but you could see spending a majority of your life with them. You may have already even gotten the awkward, "When are you two getting married?" from each other's families.

9. They make you happy.

They surprise you with your favorite Ben and Jerry's ice cream when you've had a bad day, they go along with your extravagant ideas for a paired Halloween costume while only rolling their eyes a couple of times, and they have come to love and embrace your passions and dreams.

10. You love them unconditionally.

You have grown as a couple and loving each other through it is the best part.