Equal protection yes, but why all of a sudden is gays getting married considered equal protection? The fact that married people get more benefits than two single people can theoretically be considered a violation of equal protection by your standards.
Listen, you really need to become educated on this stuff before you bother speaking. You look more ridiculous than a black dude with an afro and bad teeth wearing a superman costume.
A suspect classification is one where the classification meets the criteria that have been determined through historical jurisprudence as suggesting that said class is probably being discriminated against. When an equal protection issue is brought up for a suspect class, law challenged receives strict scrutiny. Religion and race/national origin are suspect classes.
A "quasi-suspect" class is one that meets lesser criteria but still warrant heightened scrutiny beyond the rational basis test. Those criteria as outlined by the courts are:
A) whether the class has been historically subjected to discrimination.
B) whether the class has a defining characteristic that frequently bears a relation to ability to perform or contribute to society.
C) whether the class exhibits obvious, immutable, or distinguishing characteristics that define them as a discrete group.
D) whether the class is a minority or politically powerless.
The third and fourth are not strictly necessary characteristics of the class, but they are indicative of being a quasi-suspect class and are considered by the court.
The class of "single people" meets none of these criteria. Therefore, it cannot be a quasi-suspect class. And therefore, there can be no complaint of equal protection as you have alleged.