AITA for not wanting to be friends with an ex despite the fact that we have mutual friends?

My ex is pressing for us to be friends. His rationale is that it’s because we have mutual friends and he doesn’t want things to be awkward. The thing is 1) I’m rarely around because I travel a lot for work and 2) I’m polite in our interactions (but not buddy-buddy), so I’m not understanding why this isn’t enough.
AITA for not wanting to be friends with an ex despite the fact that we have mutual friends?
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