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Meanwhile, while 19 percent of Americans report being unhappy in their relationships, they are finding it worthwhile to stay together for the long haul: the average length of a relationship is 18 years overall, spiking up to 36 years for respondents over the age 65.
In addition, the survey identified the secrets to success for the 26 percent of respondents who said they were "perfectly happy" in their long-term romantic relationships.
A sense of commitment, having a healthy sex life and feeling financially secure are also key factors that directly correlate with happiness.
Why are men and millennials most positive about relationships?
As relationships started in school, work or university are rapidly declining - 18 per cent to 12 per cent since 2007, the research also reveals more and more Brits are using online dating to find their partners.
Love is a huge factor in Americans' overall happiness.
It is not just love lives that will benefit, with e Harmony predicting the future of dating will contribute more than £256 million of consumer spending by 2030 - an increase of 81 per cent compared to today.
Couples in the South East (22 per cent) and East of England (20 per cent) are the most likely to have met one another online, while the fastest expected growth in online dating by 2030 will be in London.
Perhaps unsurprisingly, they tended to have taken the time to get to know one another before taking the plunge into marriage, were the same age as their partner or spouse, and had many shared interests, making time for each other even after having children.
On the flipside, only six percent of respondents characterized themselves as "desperately unhappy" in their relationships, and were likely to have prioritized companionship over love, lacked intimacy, and were less likely than average to be married.