Is the statement, "By Allah, I will not contact you again," followed by, "And if you want me to swear to you by triple divorce, I will swear to you, so do not provoke me more than this," considered an oath by Allah or by divorce, and what is the ruling on that?

Befriending a foreign woman is forbidden due to the harm and corruption that result from it. Your statement, "By Allah, I will not contact you," is an oath by Allah. If you contact her, an expiation for breaking an oath becomes obligatory upon you (feeding ten poor persons, or clothing them, or emancipating a slave, or fasting three days if you are unable to do the former). This promise is not an oath of divorce. You must distance yourself from this woman and repent to Allah.