No, it's not a matter of time on where you live that determines "domicile"; it's a matter of a number of things:
1. What is the address on your driver's license?
2. Where are you registered to vote?
3. Where do you have a landline (if one)?
4. What is your primary mailing address?
5. What do you consider your permanent home (like to you go to Texas with the intention of returning "home" to Oklahoma?)
"Domicile" is a collection of things and not always clear-cut, but, based on what you have written, I would imagine that you are an Oklahoma resident and not a Texas resident.
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