He had a smidgen of dog walking ability - You had lots of dog walking ability. He had a smidgen of tennis ability - You had lots of tennis ability.

The dog walking tennis relationship had to end to make the next dog walking tennis relationship he has with you a lot fairer than it was previously. You were a lot fairer when the dog needed to be walked and when you needed to communicate. You will be a lot fairer when your boiler breaks and you need him and a lot fairer when he needs to get the rest of the stuff and if you relent a lot fairer to his demands in the way you interpret s ex.
He's got what he needs. Love isn't about being fairer to each other so he doesn't need this. Love is about one giving into the others interpretation of fairness which upon recollection may not be as fair as it should be. In love you wouldn't do anything unfair, so if it turns out to be unfair one of you is justifying the unfairness and the others happy with the decision to exclude them from re-interpreting the fairness.