<human>: Give me the gist of the text in a nutshell

My fiancé had a momentary and brief crush on a private stripper ordered for his friends bachelor party. He never goes to strip clubs/doesn't have an addiction to going or anything like that, but he came back from the bachelor party thinking about her. He admitted this all to me and really stressed just how brief this period was and that it didn't really affect our relationship too much. 
It's almost been a year and I can't get over this. 

Rationally, i understand I'm taking it way overboard. But emotionally I'm devastated that after 30 min - an hour in the presence of this woman my fiancé came back to me lusting after her...even after 4 years of a mostly perfect relationship with me. 
All of this would be easier to forget except his party is next year and I'm scared to death this will all occur again. 

Reddit, tell me I'm crazy, help explain to me HOW/WHY I shouldn't take this so personally because I hate to admit it, but it's ruining what was supposed to be the happiest time of my life.
<bot>: my fiancé came back in lusting over a stripper for a brief time after attending a bachelor party and I can't help but take this personally.