There are a few factors to consider so the answer will depend.
The state taxing agencies typically will look at the overall factors for your domicile, even though both states you mention do not have state income taxes. Because you appear to have established permanent residency within Texas, have purchased a home within this state, and resided in it for several years, you appear to be domiciled within Texas. Therefore, it appears you would not meet the exemption from filing Form 8958 even if your home of record is in Florida. Page 2 and 3 of Publication 555 does provide all of the items that are taken into account when determining domicile.
However, you may be able to qualify for an exception as you mentioned for filing Form 8958, but you must meet all of the following items as mentioned in Publication 555, pages 9 and 10. Essentially, if you and your former spouse lived apart for the entirety of 2025, then your separate income is taxable only to the spouse who earned it.
You must also meet the additional criteria:
- You aren't filing a joint return
- You both had earned income during the year
- And neither of you have transferred any earned money between each other, either directly or indirectly.
You would still need to complete Form 8958, even if the living apart exceptions apply, if you may have other unearned income and deductions that would still apply under the Community Property rules as reflected here.
As far as being in the military, there is not an exception for active military pay if you do not meet the exceptions mentioned above.
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