Betty3 has provided you with an excellent resource regarding your rights as a tenant in Texas regarding repairs that a landlord has failed to address. READ IT!
While all states offer some option for a tenant regarding this matter, not all states allow a tenant to withhold rent...and even those that do require a tenant to have adequate WRITTEN documentation that they have informed the landlord of these repairs (and, in many states, to place the rent in an escrow account to show the court they have every intention of paying their rent once the repairs have been made).
Texas does NOT allow a tenant to simply withhold rent and by doing so, you have opened yourself up to facing an eviction.
Gail