I am sorry you are dealing with this problem. I didn't know the answer to your question so I googles "bed bugs, lease contract, texas" and there is tons of controverty over this issue. From what I read there is a "bed bug" clause that was developed wherein the landlord and tenant both disclose previous infestations or exposures to bed bugs and if relevant, that treatment was performed. I suppose this is intended to give the lease a clean start, assuming everyone tells the truth and no one in adjacent apartments exposes the entire building to bed bugs. There was some discussion about whether or not bed bug infestation rendered the property uninhabitable and grounds for terminating the lease. I would advise you contact a real estate attorney before making a decision on this so your are fully informed on your rights and obligations. You can also check out the link below for additional information. Good Luck!