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Like others have said it's really admirable of you to be this self aware of the relationship and considering even apologising after all this time. Any sort of friendship break up is hard especially if things weren't ended in the best of ways. 

It is ultimately up to you. If this is something you are dwelling over constantly and u feel as though apologising will give you peace of mind then I think it'd be good to apologies and get some things off your chest. Since you've mentioned that you don't want to rekindle this friendship but might want to still apologies just remember that you can still apologies while still upholding your boundaries and wellbeing. Remember to only apologies for where u felt you went wrong and not ovrerapologoes for things thT weren't your fault.

Good luck!