
#1

Interestingly, the divorce rate in the US has been steadily decreasing since the early 90s. Nonetheless, it's interesting to learn about the factors that contribute to people splitting up, whether it's a lack of support from family and friends or an extramarital affair.
In 2019, the INSIDER Data team analyzed a study done by the National Center for Biotechnology Information (NCBI), which polled 52 people (31 women and 21 men), who had been involved with PREP, a "prevention and relationship enhancement program" that focused on teaching couples communication and conflict resolution skills.
The course took place before the couples tied the knot, but the study surveyed individuals who ended up divorced, 14 years after PREP took place. It aimed to glean information on why their marriage had failed, and whether it had been a combination of factors, or due to a "final straw."
#2

Little or no premarital education and religious differences — 13.3%. Even though all those surveyed had participated in PREP, for some it still wasn't enough. "I probably wish that we would have had more premarital counseling and had somebody tell us we should not be getting married," one participant said. Another added that, while the course was helpful in communication, it wasn't realistic about the growth of marriage. "Premarital counseling teaches you how to get along, and that you should communicate, but it doesn't really talk about the phases of a marriage over time."
As for religious differences, 69% of married people say that their spouse shares their religion, according to a Pew Center survey. And on average, per Fox News and according to the book "Til Faith Do Us Part: How Interfaith Marriage is Transforming America," couples in interfaith marriages are less happy than those in same-faith marriages.
#3

Lack of support from family — 17.3%. According to a 26-year longitudinal study that looked at 373 couples, a husband having a close relationship with his wife's family decreased the risk of their divorce by 20%. However, a wife having a close relationship with her husband's family increased the risk of divorce. According to the study's researcher, psychologist and professor Terri Orbuch, "Wives should maintain boundaries with their in-laws, and husbands should remember to take care of their in-laws and treat them as important."
#4

Substance abuse — 34.6%. At least one partner in 50% of the former couples surveyed by the NCBI cited substance abuse as an issue: 34.6% of individuals overall did, but in only 33.3% of cases, both partners agree that substance abuse was to blame for their divorce. "He never admitted that he even drank. It wasn't me against him. It was me against him and the disease," one participant said. Of those who indicated their marriage indeed had a "final straw," 12.1% reported it was because of substance abuse.
#5

Too much conflict and arguing — 57.7%. Survey participants revealed that they didn't resovle their conflicts calmly or effectively, and it only got worse over time.
They reported that "communication problems increased in frequency and intensity throughout their marriages, which at times seemed to coincide with lost feelings of positive connections and mutual support." One participant concluded, "I got frustrated [with] arguing too much."
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