I think Melania Trump married a lifestyle she wanted, not a man she particularly cared for. Take away the money and what is Trump? A fat old man who doesn't read books, "white trash" by his own estimation" (he himself said that if you take away the money, he is just like his "white trash" devotees) and the closest he would come to culture is the bugs growing on his cheeseburgers.
I also think that Melania is one smart cookie who is making herself unavailable to the Trump circus until her bank account receives a substantial cash input, and Stormy has given her an very lucrative opportunity to sell her appearance services back to Trump. Just as Jackie Kennedy demanded a million dollars as appearance fees after Jack Kennendy's peccadilloes became very public.
Melania has a strand of opportunism that blends with Trumps, it's something they have in common, as well as a penchant for self promotion that is indifferent to truth. Example: a degree in architecture and design? Not. But it sounded good and the lie was used to inflate her public persona.
They are quite well matched, though he is more of a stranger to the truth than she is, or that's how it appears to me. They will exploit each other for their own ends, for as long as it suits their joint and individual self interest.
The first lady spokesperson against bullying? The most amusing irony in USA politics for a long time, from someone who married the poster boy for bullying (and from a very early age). Laugh all the way to the bank Melania, I wonder how much of a pay off she is demanding.