I caught my man flirting with his ex on Facebook, how upset should I be?

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He has been talking to her a lot, but we live together (together 5, living together 2) and she lives in another state. He posted a ? about memories and she put one about him sticking up for her once, and having a great body and having a crush on him, he posted one about her and how she was always so happy to see him. He admitted it was flirting this morning, and I'm kinda hurt by it and want to post something to her even though we aren't friends. What is the best way to handle this situation?!?!
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can anyone give me advice on how to handle this situation?
I caught my man flirting with his ex on Facebook, how upset should I be?
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