Can You Guess The Trope?

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Across
  1. 2. Unlikely friends become something much more
  2. 4. Platonic relationships are overrated
  3. 5. Till death do we part.. or not.
  4. 7. "There's no way we'll have real feelings for each other!"
  5. 8. Three's a crowd
Down
  1. 1. Opposites attract.
  2. 3. You are the bane of my existence
  3. 6. It's late at night. They stumble into a tavern.