A long term relationship takes a lot of ingredients to make it last. There's got to be spice in a relationship! The two have to experience what it's like to have a amazing sex life. If there's not good sex then there's no attraction between the two. The two also got to be faithful, honest, and fully committed to each other. They both have to always have each others back. Because not only are they lovers but their also best friends. That's a few ingredients to a long lasting relationship, but just with those ingredients can end up having a relationship lasting long.