http://revach.net/article.php?id=5077

Section:  Avodah   Category: Bnei Bayscha
Parshas Naso: Chasam Sofer - How To Wreck A Good Marriage

Rashi brings Chazal that the reason why Parshas Sotah comes right after the commandment to bring our Matnas Kehuna is because the Torah is teaching us that if someone does not bring his dues to the Kohen, he will eventually bring his wife as a Sotah. What is the connection?

The Chasam Sofer answers that there are two things that Chazal say bring wealth to a person. One is Maaser (Shabbos 119) and the other is spending generously on your wife (Bava Metzia 59a). A person may say why should I give Maaser, I will just spend lavishly on my wife and that Segula will make me wealthy.

To this the Torah warns, if you spoil your wife and skimp on Maaser, your gifts will create disaster and you eventually bring your bejewelled Sotah to the Kohein, instead of the money that belongs to him.