How do military spouse vote?

My husband and I are originally from texas. I have a car that is in my name. title and plates are still under texas. We filed jointly on our taxes, and put down texas as our state of residence, i think. Texas doesn't collect a state tax. We now are in Washington state and my husband is active duty army here. I have registered to vote in Texas and voted in texas for the governor election. My husband I don't think was ever a registered voter in Texas. We now live on a military post in Washington state. Which state do my husband and I get to vote for, texas or washington? How do we go about doing this?? I want to vote for the primary (if still possible for WA) i know texas has already done that. I also want to vote for the presidential election. please help! thank u.