Does a divorce that was made conditional upon an action, and that action subsequently occurred, take effect, bearing in mind that the wife was menstruating at the time the husband's action was discovered, and what are the implications of that?

If you swore that your wife would be divorced if you returned to chatting with girls and she found out, then your wife is divorced by her knowledge of it, even if she was menstruating.

If it was the first or second divorce, you may take her back before her iddah (waiting period) ends, either verbally or by intercourse.

If it was the third divorce, then she is irrevocably separated from you, and she is not lawful for you unless she marries another man and he consummates the marriage with her, then he divorces her, and her iddah from him ends.

And you must repent from chatting with girls.