Tending marriage

I was thinking the other day that even though marriage is frustrating at times there is no way I could imagine us not being together. How do people that? There is no one better for me than my husband, other than the "improved" version of my husband, which I am not sure really what that would be. I suppose the improved version for me would simply be that he was less angry, more God centered and a bit more emotionally supportive. But not too much or he would drive me crazy in another way.
I just keep thinking my best gardens are the ones that have evolved to be what they are. They surprise me how they shape and take form. A plant dies, something else goes in, but overall I know I would have never designed my gardens to be what they are today and starting a garden is way more work than tending gardens. I think marriage is like that. I would really rather tend it than start over and not only can I not imagine anyone else for me, I certainly can't imagine anyone else for him. LOL!
Maybe I am thinking to highly of myself, but come on. Yes he is handsome, in good health, stable, a good Dad. I'm not saying someone else wouldn't want him, I'm just saying I think he would miss everything about us, just as I would. We have a beautiful home, property, children and a dog. We did all of it together over the last 12 years and what could be better? Especially our children.... they are so precious and perfect to us. Not perfect like they are flawless individuals. No one is that, but just that they are ours. God's gift to us to steward and mentor through this earthly life, created from us. It's hard not to want to be the best you can be God and for them so they try to be the best they can be for God.
I'm getting carried away. I just was thinking that tending a marriage and the benefits of all the time invested in a marriage is so much sweeter, beautiful, and enjoyable than even the beginning of falling for someone, which is short lived and more like annuals than perennials.