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Is she really that interesting as a friend? Don't you have other friends? Do you want to tell your new girlfriend that you still talk daily/weekly to your ex? Tons of trouble not rewarding. There is a difference between being friends and staying in contact with your ex meaning you never talk to her unless you bump into her once in a lifetime.
If she's friendable sure. ... And If no feelings are involved
As long as there are no more feelings towards each other that would bring your relationship back then I think you should.
If you can handle it, yeah
My ex of 10 years is my best friend.
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