How do I behave at work after a break up?

My boyfriend broke up with me bc of something I did (I acknowledged my mistake and apologized)... but now we have to work together. He said he could rethink his decision, but for now it is what it is.

I don't know how to behave. Plus there are a lot of things I want to tell him. I don't know if I should keep quiet and leave it or speak up.

And I don't know how he would act. We work desk to desk.

Are there any tips? I know this is pretty fucked up situation.

How do I behave at work after a break up?
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