I've read your full story and I want to give you some tips.

You don't have to hold on to marriage if the only reason for this is your promise to yourself that this marriage and divorce will be your last. Try to make your life as good and comfortable as possible.

Plus your wife is used to feeling like a victim, and that's a real problem. She is attached to her ex and doesn't understand why. Often women who are victims of their husbands become attached to them and feel pity for them. It needs to be treated! Because this is abnormal and interferes with moving on in any area of ​​life!

Also, if you really understand that your sex isn't good enough, you can look into more information on this topic, luckily there is a lot of it on the Internet. Talk to your wife about exactly what she would like to get off sex with you. Perhaps one frank conversation will be enough.
If you and your wife decide to keep the marriage and not file for divorce in Texas, and she will recover, it's better to forbid her to communicate with her ex, or talk to him about the fact that you would not want him to be present in your family life.