Husband's ex-girlfriend sent him messages, all at night, once in the middle of the night.

Women should be generous. If the so-called ex really went too far, she should reply rationally. To tell the truth, men are disgusted with constant entanglement. In fact, she didn't hurt your feelings, which can be completely ignored. Sometimes neglect is more destructive than care, and you can let go. I believe your husband will be more grateful to you in the future, but on the surface, you should pay attention in private. After all, there are always some counterexamples.