Based on the context and the answer, generate a question. 

Context: It was not easy , coming to the conclusion that the husband I once loved dearly had betrayed me and our marriage vows , but at least I knew for sure . If you are in the same situation I was in , I urge you to check out that book .

Answer:

He became close with someone else .



What is the reason I think my husband betrayed me and our marriage vows ?