1. Lying

It's hard to gain trust again.
2. Economical problems

It can be losing a job, going bankrupt, credit card debts, etc.
3. Violence

Even couples don't divorce it will be only on paper.
4. Cheating

It's one of the main reasons, which also leads to lack of confidence.
5. Alcohol and psychological problems

Even if you ignore it at first, it will result in many problems.
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1Opinion
I agree, each of these reasons can be a problem.
thanks for sharing
totally