My husband and I have been married almost 27 years.

For the last few months, we've been trying out Blue Apron, the refrigerated box that brings weekly meals and recipes to your door.

His words the other morning were, and I quote, "I'm liking Blue Apron. It's nice after soooo loooong together to have something new to look forward to."

I laughed ... luckily.

I've given lots of thought to how a good marriage or long-term relationship changes you. What exactly is it that causes us to look forward to coming in the back door after a long day and hear your other half puttering around the kitchen?

What do we get out of being partnered for many years? What keeps us from moving on to a newer model - something where we might be able to experience that lust/love of so long ago? Why do we keep our role in this particular play and not yearn for a spicier part?

Here are seven answers to those questions.

1. Watching someone else live their life very differently than you expands your very being.

There is a widespread belief that dogs and their owners start to look like each other. So what happens when your companion is human?

When you share your life for a long time with someone else, you begin to absorb some of their perceptions - not to where you necessarily adopt them yourself, but you can realize there's a whole other way of looking at things. You may have to "agree to disagree," but even the discussion changes you.

You expand how you take in the world.

2. Seeing someone else falter, make mistakes or downright fail in such an intimate way leads to more compassion - for them and for yourself.

You watch him lose his job and become depressed. You watch her work way too hard and burn out. You observe each other trying to parent - the toughest job of all. Perhaps you would've judged in the past, but you're not as likely to anymore. You recognize with the years that no one is always successful - everyone will struggle. You're still worth being loved.

3. You experience true trust

Feeling loved for all of who you are, warts and all, builds an immense level of trust. And loving someone, for all of who they are, knowing their vulnerabilities, is a tremendous gift.

It's not that we can't see our partner's weaknesses, but in a healthy partnership, we come to understand them and love them anyway.

4. Having a daily touchstone lends a sense of security

Someone knows where you are and what you're doing with your day. Even though it may be pseudo-security, or a false sense of control, it's still helpful. None of us know what will happen in any given day. But knowing someone is keeping track of you feels good.

Sadly, this is often the reason why people stay unhappily married. They're scared to be by themselves. I'm not knocking this - being alone is hard.

5. Compromising helps you stay open and giving

If it's acquiescence, it doesn't work. If it's martyrdom or dictatorship, it doesn't either. But healthy compromise - not always getting things the way you want them and realizing what the other wants or needs is important as well - keeps you focused on others, not just yourself. Through the years, you both help each other experience what you want or can have from life.

Compromising leads to gratitude and celebration.

6. You've lived with integrity

When I divorced the second time, I was afraid I didn't "have what it took" to be married. Perhaps I was weak or not able to sustain loyalty. Maybe I was a whiner or selfish. There was a lot of shame.

With time, the ache of failure has dissipated and the acknowledgement that I have the capacity to get through hard times has been proven.

That's a really good feeling. Whatever kind of vow or promise you made, you're keeping it. You've lived with integrity.

7. You have an unparalleled depth of experience with your partner

After a divorce, I frequently hear, "What I miss is looking across the room when my daughter does something awesome. He would be looking back at me, with the same proud look in his eyes as I knew were in mine. I really miss that."

Long-term relationships have an innate complexity to them, not to be found in their newer counterparts. The threads between two people are woven in an intricate pattern of light and dark, shimmer and shade. Pull one thread and the others shift in response.

Let's face it. Sometimes, marriage is boring. You hear (and tell) the same stories over and over. You watch yourself and your partner getting older. You get irritated by the same things that have always irritated you and will continue to irritate you.

Hang in there. Wait until the play is over.

There's lots of good stuff that happens after the intermission.

Check out Dr. Margaret on her new podcast, Self Work With Dr. Margaret. In each episode, Dr. Margaret takes a direct, solution-oriented approach to depression, anxiety, trauma or grief to guide you toward the changes you want.

Editor's note: This article was originally published on Dr. Margaret Rutherford's website. It has been republished here with permission.