According to research from the journal Obesity, dating and cohabiting can lead to weight gain. The 2009 study looked at 1,293 dating, cohabiting and married romantic couples, and found that over five years, women who were dating put on an average of 15 pounds, and those living with a romantic partner gained 18 pounds. Men also have an increased risk of becoming obese as they stay in a relationship, but not nearly as much as women.
This article might help you turn things around.
Is Dating Making You Fat?
Fall in Love Without Falling Off the Wagon www.sparkpeople.com/resource/wellness_arti