My mother once told me that love never stays the same - it's either growing or it's withering. There's no plateauing when it comes to love, which is why it's so important that a husband and wife are constantly working to strengthen their relationship.

Keep your relationship happy and healthy by saying these 10 things to your spouse every day:

1. "I love you"

This one is a no brainer, isn't it? You might think so, but sometimes couples get so caught up with everything else that they forget to take time to say those three words.

Tell your sweetheart this every day. Don't worry about everything else going on around you; it doesn't take much time, and your spouse will adore knowing they are loved.

2. "I appreciate you"

While this is similar to "I love you," it's always nice to be noticed for the work you do. Let your honey know you appreciate that they took the kids to the park so you could have some peace and quiet.

This simple phrase lets you see the service your wife or husband gives, while also making sure your honey feels appreciated.

3. "Let me help you with that"

If your spouse is washing the dishes, offer to put them away. If you see your man struggling, step in to help. If her arms are full (literally or figuratively), take half of her workload. The happiest couples are the ones who each put their partner's needs before their own.

4. "This made me think of you"

I love when someone sees something that reminds them of me. It's a sweet way of letting someone know that you were thinking of them throughout the day.

You can either send this phrase as a text or save it for when they come home to start up a sweet conversation. Either way, they'll love it.

5. "I'm sorry"

When you're both tired and stressed, it's easy to get cranky with each other. So many relationships end badly because each person refuses to apologize or points the blame on anyone but themselves.

It's only a matter of time before you make a mistake, so promise now to apologize and forgive your partner when they slip up. You and your marriage will be happier for it.

6. "I missed you"

Whether they were gone for a few days on a business trip or just at work for the day, let them know you missed them. Things are always better when the two of you are together, so let your honey know that you're happier when they're around.

7. "You're my favorite"

Isn't this the greatest thing to hear from your love? You two should be best friends, but it's always nice to hear a reminder of how close you are.

8. "Thank you"

Your love works hard for you every single day. Let them know you notice their hard work and love them for it.

9. "How are you?"

Happy couples check in on each other. They make sure they know what's going on in each other's lives. Ask this question, and be ready to receive an honest answer.

10. "Goodnight"

We've all heard the rule "never go to bed angry." While it may not always be possible to find a 100 percent solution to every problem before bed, you should always go to bed feeling comfortable and safe sharing a bed with your honey.

Saying "goodnight" is a sweet, subtle way to tell your spouse that you love and care about them.

By saying all these things, you're letting your sweetheart know that you love them and care about them. These simple phrases will help your relationship grow and flourish, no matter what life throws at the two of you.