If you want to do something Shakespearean, your young eladrin, a flirtatious sort, had a tryst, perhaps ongoing, with a buxom lass that turned out to be Titania, Queen of the Summer Court. This is a huge problem for the young eladrin as his Lord and Patron, to whom his Oath is sworn, King Oberon, is husband to Queen Titania. This situation is a bit of a pickle for everyone. Titania must deal with both lover and husband (not the first time). Oberon must deal with his wife and queen as well as a loyal Paladin of his Court. And your young eladrin is caught between the two greatest powers of the Realm.

For Titania, there is not even a choice. Of course, she sides with her liege and husband and abandons the poor eladrin (again, not the first time).
King Oberon, unwilling to destroy an otherwise loyal follower, yet unable to just let it be, chooses exile for the poor eladrin.
The poor eladrin is now banished from the Feywild, stuck in the material world, where he must either learn to live or find redemption and return in honor.

You have a love triangle, banishment in disgrace, hope of redemption and an otherworldly character out of place in the mundane world.