All perfect praise be to Allah, The Lord of the Worlds. I testify that there is none worthy of worship except Allah, and that Muhammad is His slave and Messenger.
Leaving Islam and becoming a disbeliever is not an easy matter. A Muslim does not become a disbeliever for a simple reason like the one you mentioned in your question (i.e., breaking your oath).
The principle rule stated by the scholars is that the one who is confirmed with certainty to be a Muslim cannot be ruled to be a disbeliever except with a certainty equal to the certainty that confirmed his belief.
We warn you against falling prey to the whispers of disbelief because many evil consequences can result from falling into this trap.
By going back and checking your previous questions, we noticed that you afflicted with whispers regarding oaths, and this is why you repeatedly ask the same questions. What you mentioned in this question confirms this fact. Therefore, we advise you repel these whispers and shun them, because the person who is overcome by whispers is not held accountable and therefore, there is no consequence to the oath you made.
Regardless of this oath, you should beware of talking to this non-Mahram (marriageable) woman, because talking to non-Mahram women is prohibited unless there is a need for that, provided that Islamic regulations are adhered to; please refer to the following Fataawa: 10463 and 133626.
Finally, you must know that it is also prohibited to have a friendship with this girl since she is a non-Mahram.
Allah knows best.