"4 You are of God, little children, and have overcome them, because He who is in you is greater than he who is in the world." (1 John 4:4)
The power of the one that is in you is greater than the power of the problems around you. Jesus went to the cross to bear the weight of your sin, your problems, your worries, your struggles, and your marriage.
Whatever weight that the world has laid on your shoulders is not as powerful as the one that lives within you. The one that is within you defeated everything that can come against you.
He is the reason you are able to keep walking! He is the reason you are able to trust in the promises of God! Because God kept His promises by sending His only Son. Now, you are never alone. You are able to keep walking no matter what life sends your way.
It's not always easy, but it's never alone, because of the power of Christ within you.