This appears to be situation that could be perfect for a surrender agreement between you and the landlord, in which you agree to vacate the property and both sides agree to release one another from claims under the lease they may have against the other.
Of course, you could make claims for damages due to the bed bugs, and they could make claims for rent, and you could both fight over who caused the bed bugs in the first place.
See if the landlord wants to start repairs and then agree on a date for you to vacate, and memorialize everything in writing, including the landlord's waiver of claims against you. You can have an attorney put together a short surrender agreement in a little time, and it could be well worth the effort.
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I agree with the above answer. Whenever anyone has sustained bed bug bites, they should retain a bed bugs lawyer by googling "bed bugs lawyer"...here, I did it for you www.Bed-Bugs-Lawyer.com
John Lassen 1-877-252-4630