Is it ok to ignore an ex boyfriend if you bump into him?

Anonymous
I am going to be back at uni tomorrow after going on exchange. This will be the first time i bump into my ex after 7 months. Things ended badly, him being a jerk and me deciding not to be friends as a result (he wanted to remain friends). I know I will bump into him since we are in the same faculty. He also has mean girl friends who bullied me when i was with him. He stood up for me at the time. Anyway, i googled this and so many websites say its always good to be polite and say hi and make small talk. I am preparing myself for the moment and i see no reason to make small talk. I thought a brief smile and walking away/ahead is better. Any tips? How would he potentially feel?
Is it ok to ignore an ex boyfriend if you bump into him?
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