How can one reconcile repentance from the act of sodomy with maintaining friendship with the other party who has distanced himself, especially if this friend has a positive influence in religious matters?

We advise you to go to the houses of Allah and circles of knowledge to find someone who will take you by the hand towards obedience and assist you in goodness. Once your faith is firmly established, then be a help to your friend in steadfastness and uprightness.