Is it bad I left my fiancé for a former student?

I been with a girl for 3 years and left her because I was constantly cheating mentally with a student at the time. She was very nice and sweet girl so I wanted her more. I almost even gave her a ride home. I knew her dad wouldn’t approve Of the relationship between us. I tend to stare a lot in lust. My ex fiancé even knew I was thinking about a student and she didn’t like it. I broke things off the day of our marriage.

Is it bad I left my fiancé for a former student?
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