Visitation and relocation?

My Ex-Husband and I got a divorce in the state of TX. Since then I have relocated to CA and have lived here for over six months. In our decree it states that I can relocate wherever I choose to. I have sole custody of our children ages 3 and 1. In the decree it states if I move he has to visit with the children in the city which I live in and cannot take the children out of state. He lives in VA. Neither of us has resided in TX for over 6 months. He is able to take them for two weeks and it states he has to give me written notice. He has certified a letter he sent to my old residence in TX stating he will be picking up our children at my old TX residence. I gave him notice I had relocated to CA over six months ago. Can he legally con me into traveling to TX for the visitation?