Looking for Clarification of Assault vs. Domestic Violence

My question involves criminal law for the state of: Texas

In 2005 I was arrested and charged with Assault with intent to cause bodily harm. This involved a situation with my ex girlfriend. We dated for about a year, did not live together, have no children etc etc. The charge was filed as assault.

I am preparing to buy a firearm and have been looking for clearcut answers. Will the fact that this assault involving my ex girlfriend (even though I was not charge with domestic violence) prevent me from purchasing a firearm?

Thank you in advance for any help you are able to give.

*For further clarification*

Texas Family Violence law states it CAN include a previous dating partner.

But the Federal law (in relation to firearms) states it must be a spouse/family memeber/someone you share a child with/or someone you have or currently cohabitat with.

Will the federal law be the final determining factor?

What were you actually convicted of?

Assault with Intent to Cause Bodily Harm was the charge.

Go to court and see the court clerk to get a finial despotion of the case,it will list what the final conviction was. It appears that you have a conviction for class a misdeamanor for Assault with Intent to Cause Bodily Harm.