Should I be ok with my GF is going to a party her ex will be at?

Anonymous
So this girl I'm seeing asked me a couple weeks ago to go to her friends bday party at her friends house. I said yes at the time and with the party now 3 days away she tells me that her ex will be there and asked if I was ok with it. I asked how recent this ex was and she said November they broke up. She asked if I was ok with it and unfortunately I said yes. The more I think about this I'm pissed that she would want to go to a party her ex is going to be at and I really want to tell her I'm not ok with it. When I asked if she'd talk to him she said she might just say Hi. We've only been dating for a couple weeks and I do really like her. Do I just let this be and go with her or call her out on it and say go without me. Really at a loss here. Help.
Should I be ok with my GF is going to a party her ex will be at?
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