Misogamy

Misogamy is a word used to define an individual's aversion or hatred of marriages.

A person who hates marriage can be called a misogamist.

Originating from the Greek it is a combination of - Miseo (to hate) and Gamos (marriage).

http://cancerweb.ncl.ac.uk/cgi-bin/omd?misogamy
http://www.tiscali.co.uk/reference/dictionaries/difficultwords/data/d0008355.html