It seems that he didn't know this woman well enough. He only knew her in good and easy times at college. What kind of love is it when a woman berates her man and makes his unhappy because he doesn't make enough money? When times are hard is the time to "circle the wagons" and do everything to make things better and warmer in the home. It is the time to share as much reassurance and hope with each other as possible. It is the time for each to do extra tiny things that enhance life for the other, and for both of them.
This is an instructive story and I hope that unmarried readers here can learn from it so that they make every effort to learn the other's real character. It is important to discuss everything before marriage and to listen well. It is important to discuss what you think about this kind of story with your own beloved, listen well, be truthful yourself, and be sensitive and truthful to yourself about what you hear and feel from the other. Decide carefully if this is the person who will be able to be strong and true for you, and if you will be able to be strong and true for her through all things. It is a mistake to think that marriage is the happily ever after, as in fairy-tales. It is really the beginning of many tests and both must be willing and able to work through them. Both will become mature if they do.
Only if this woman matures can the man regain his love for her. I hope they don't have any children yet. If there are children it is more complicated. Do you have marriage counsellors in your country? Here it would be seen that they need a well-trained person who is skilled in working with both marriage partners to cousel with each of them, and help them to understand and grow. They need to learn to communicate with each other again, and she needs to grow up and mature. (Maybe he does, too. Who knows from the story.) As told, her side sounds like it is the worst. It may or may not be possible to save the marriage.
If there is no marriage counsellor they need to try to talk truthfully and gently over a period of time with each other, and to explore how they may become supportive friends again. If they can regain friendship, then the love will return. If the previous friendship was real, then there is hope that it can be regained. If it was only based on "how beautiful, charming and much fun she is, and how handsome, and what a good provider he will be, how comfortable I will be as his wife, --then I would say there is a real problem. They need to become true friends. Each needs to be trustworthy, and to be seen so by the other.
I wish them the best.
Maryk