Guys, why would you avoid seeing your ex?

Just a few days ago.. we bumped into each other in a club... he was with his friends I knew so I went up to chat with one of his friends... but he quickly left the group.. and disappeared.. then I called him to say if we could meet for a drink.. he said he needed to go.. I know he is trying to avoid but why?
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when is the best time to meet your ex?
Guys, why would you avoid seeing your ex?
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