Marriage needs careful thought and understanding of your partner. If questioning your choice, certain signs may show you married the wrong person. Let's examine top responses to, "When did you realize you married the wrong person?"
Married and honeymooned in China as Ph.D. students. Wife's father gave her $10k for the trip; it was meant to be a bit of holiday and research. Ended up mostly alone in hostels while she researched. Saw email she sent to her father, stating she wished I wasn't there. Regretted not leaving after that revelation. [Source]
"On my wedding day, my bride spent more time getting drunk with her friend than with me. She even passed out and our wedding night was spent with her sleeping it off. Five years later, she admitted she didn't love me and wanted a divorce."