Definition: Given a real-life anecdote of a complex ethical situation, generate a suitable title that describes the main event/root cause of the situation. Imagine that the given text is a social media post, and you have to write the title of the post, so the users can decide to read the main text or not.
Input: So my girlfriend went out to a company party where a guy works that she once had an affair with in her last relationship.

She told me about it and said that it was a mistake.

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Anyways, she went to the party , and after the party she, him and another girl went out out bar hopping. She didn't write me all night and she knows I don't like the guy.

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Well I was worried and felt like something was off so I checked our app where we can see our location and saw she was at the guys house.

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The next day when I drove to her house I was very upset and scared. I confronted her and  She told me nothing happened, they got drunk and she couldn't drive home so she spent the night at his house, she slept in the bed with the other girl and he slept on the couch. She was still hungover when I did this. 

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Ever since then I seem to be more uptight when she goes out with other people and it hurts now that she hardly ever invites me.

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She said what happened in her last relationship shouldn't be held against her, which I can see but it still makes no sense to me. I would never sleep at an Ex let alone a guy I had an affair with. 

AITA?

having trust issues with gf after her sleeping at an old affair's house