Scientific research on successful vs unsuccessful long term relationships has already been done by the Gottmann Institution. You can get a good presentation of

Scientific research on successful vs unsuccessful long term relationships has already been done by the Gottmann Institution. You can get a good presentation of the findings here: https://www.youtube.com/watch?v=LLXX8wzvT7c https://www.youtube.com/watch?v=LLXX8wzvT7c My warning from bitter personal experience: Don't go into a long term relationship without learning from Gottman first!