Thank you for your follow up.
Unfortunately, in Texas, in order for a couple to be considered to be common law husband and wife, it is not sufficient to live as husband and wife, but also evidence and eyewitnesses would have to exist, who can testify under oath, that the couple was not known to be engaged, but rather presented themselves as husband and wife and I am afraid that generally, unless such evidence exist, it would be close to impossible to prove that common law marriage existed, especially after one of the fiancee is deceased.
Unfortunately, fiancee generally would not have any right to any estate or any of the deceased or any of the deceased personal belongings, unless there is a valid Will which states that fiancee was to receive certain assets after the death and Texas law does give all of the personal belongings / assets of the deceased (who died without a Will) to the closest blood relative, if the deceased was not legally married.
I am very sorry to provide you with this bad news, but please understand that I do have professional obligation to provide JustAnswer.com customers with correct answers, even when answer is not favorable to the customer.
I wish you the best of luck and God bless you!