Am confused, to know exactly when the woman is online or offline as well as your husband she would have to be with you most of the time.
Anyway, if your husband has done this before is understandable that you would feel suspicious, building trust after a breach like this can’t be easy when, like many of us, he is probably online quite a lot. And it really isn’t a case of growing out of it your husband is a grown man who needs to take responsibility for his actions as well as your lack of trust in him.
There is only one way to deal with this and that is to ask him outright if he is cheating online. Of course there is the chance he will deny it but tbh if you feel so insecure in your relationship after the last episode you need to tell him and both of you need to decide where you go from there.
Wishing you luck with this.