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Article:

Office Romance Can Fire You Up -- Or Get You Fired

10. End things with dignity

If and when the relationship fizzles, avoid drama and treat your ex with respect. Leave your bitter feelings at the office door, and refrain from bringing coworkers into your tangled love web. Any unprofessional behavior could end up backfiring on you.

And whatever you do, don't dump one coworker for another! Have faith. Love will come knocking again.