How would you feel if your fiancé spends a night at her ex’s house?

Anonymous
Me and my fiancé are in our early 30’s. I’ve never been married and she had in past right after high-school. we’ve been together about 5 years and have had a great relationship besides some minor issues just like all couples.

Yesterday afternoon she tells me that she needs some documents signed by her ex. I knew about the docs and i was totally fine with it. I didn’t think of it much because I trust her and she’s always hated the guy.

She went to see him yesterday around 3-4pm and returned this morning around 10am. She said she got very sleepy and just decided to sleep over at his house. I found it very weird and annoying since she usually gets very jealous if i even talk to a random woman and she does this. I was cleared frustrated and annoyed at her and she kept telling me that I’m blowing it out of proportion. She said she slept in different bed and was just very tired to drive back.

I’ve come out to a library to relax and also because I don’t wanna be home with her.

I believe that she didn’t cheat on me or anything but just can't let it go. I don't know what to do or how to let it go? Any ideas?

Tldr: my fiancé slept at her ex’s house and I don't know how to feel about it or get past it.
How would you feel if your fiancé spends a night at her ex’s house?
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