You're hearing different things because everybody's guessing. No one can tell you for sure when he will be paroled. He will be eligible when he's been in custody on the case for six months. It is possible to parole out of a county jail but it's rare and difficult to pull off. The last time I was able to do it, I had to nag the jail population manager for a few weeks to get it done.
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§ 508.145 TEXAS GOVERNMENT CODE sets forth eligibility for release on parole.
In your boyfriend's case he will likely be eligible for release on parole after he has completed approximately one fourth of his time. However, this is not a guarantee. It will be a decision of the parole board as to whether he will be released after serving those six months. He is getting credit for the time spent in jail. But only for the case that he was booked under. If he was booked under another case (misdemeanor) then he may not have gotten credit (on the felony case) for the time spent on the misdemeanor case. His lawyer and the judge should have told him how many days credit he was given at the time of his plea.
The information provided is not advice but a legal perspective and you should schedule a consultation with the lawyer of your choice.