A study by samantha joell, who gathered this huge datus at k over 11 thousand couplesy to find out what predicts successful relationships. The biggest lesson is it surprisingly hard to predict romantic happiness with the trait of two people in that rela ship. If you generally like life, you're going to be happy in your relationship as well. There's a lot of truth to the idea you should work on yourself first before you look for some one else to make you happy.