What would you do if you accidentally meet your ex?

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Because I told my friend in one of our random conversations that I haven’t eaten yakitori (Japanese style skewered chicken), she made a reservation in her friend’s yakitori shop and set a date for us to meet and solve this immediate problem. The shop is typically Japanese with its cramped space and homey ambiance. The owner/ chef/server/cashier is a beautiful middle aged Japanese lady who gestured her way to my heart. She couldn’t speak English but I’ve never felt so welcome. Most of the customers were local patrons who knew each other from way back then but they were all charming to me. While my friend chatted with a few of them, I gobbled everything chicken and grilled and skewered. Then the door chime sounded and a tall guy with a sexy mustache entered the shop along with another man. The owner/chef/server/cashier greeted them enthusiastically and called my friend’s attention who was so engrossed explaining to me about chicken liver and chicken innards. I saw her blush and flush and blush then flush again before she regained her composure. Apart from the ‘long time no see’, she didn’t say anything else to them. Most importantly, she sounded sooo brain-scattered as she tried to piece back her chicken innards speech while wiping the beads of sweat on her forehead. And I said, ‘Ok what’s the problem?’ ‘He’s my ex-boyfriend,’ she blurted. So. There was an exchange of stolen glances from across the room. She blushed once more as the ex-bf bought us drinks. She turned even redder when he clinked her glass for a toast. An amusing phenomenon which made me feel like a teenager again. So going back to the question. What would you do if you accidentally meet your ex?