How long should I wait to pursue a relationship after ending one?

So I've just got out of a 5 year relationship (Had two children with her) I was just wondering how long I should wait to pursue another relationship without the previous persons feeling getting hurt? We have been on and off for a while before this and are being very civil now things have finally come to an end, I really don't want to ruin that by making this uncomfortable for her?
How long should I wait to pursue a relationship after ending one?
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