Ref. No. 2146/44-2203
In the name of Allah the most Gracious the most Merciful
The answer to your question is as follows:
After one divorce, when the three menstrual periods have passed, it became irrevocable divorce and your marriage is no longer obtainable. Hence, she became a stranger to you. Nevertheless, if the woman wants to marry another man, she can do that. And if she is ready to marry you and both of you agree to get married again, then you can get married and live together, but it should be kept in mind that in the future you will have right to only two divorces.
الدر المختار وحاشية ابن عابدين (رد المحتار) (3/ 409):
"(وينكح مبانته بما دون الثلاث في العدة وبعدها بالإجماع) ومنع غيره فيها لاشتباه النسب".
الدر المختار وحاشية ابن عابدين (رد المحتار) (3/ 418):
"(والزوج الثاني يهدم بالدخول) فلو لم يدخل لم يهدم اتفاقًا قنية (ما دون الثلاث أيضًا)."
Darul Uloom Waqf Deoband
And Allah knows best
Darul Ifta