Prom with an ex? Yay or nay?

So I broke up with my boyfriend of nearly a year last November. We had talked about literally everything, including prom next year. That means that I had agreed and he made me promise to go with him to prom.
Now since prom season is coming up for the students in the year above us it got me thinking. Since we broke up, does my promise still apply?
I can't exactly ask either because we don't talk.
What do other people think?
Prom with an ex? Yay or nay?
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