Most likely the reason why the rule was never made known to you was because your Bible Study Conductors never envisioned that someone from their congregation would seek anything from their Bible Study Student.
Jehovah's Witnesses can not date someone who is not a Jehovah's Witness.
There are a lot of rules that will not be made known to you. You will come to know of these rules as you progress in your studies. The more that you progress, the deeper that you will sink into the religion becoming difficult to leave even if you wanted too.
You are saying that the girl's response was a, "Crock of sh*t." Jehovah's Witnesses are taught not to lie and even a white lie is a lie. Therefore, she committed sin when she lied to you.
As a Jehovah's Witness, you can not miss meetings. The only time that you are allowed to miss meetings is for a dire situation, such as being hospitalized. Therefore, not attending the meeting because, "You were feeling down" is not an excuse and is not looked favorably. If your Bible Study Conductors were to become aware of why you missed the meeting, they will say that Satan has gotten to you. I would just tell them that I was not feeling well and that would be the truth. You were not feeling well. Do not be stupid in being honest with the Jehovah's Witness organization. The Jehovah's Witness organization has lied countless times. Therefore, there is no reason why you should be honest with them. Someone on this page stated that Jehovah's Witnesses are not worthy enough to know his beliefs and I say the same thing to you.
If you are feeling suffocated, this is only the beginning. It will get worse. Jehovah's Witness is a religion where you are stripped of who you are and everything that you are. You are to put Jehovah first.
You stated that, "You are going to lodge your vacation time." That sounds like a very good idea. Go on vacation. Let your Bible Study Conductors know that you are going to be going on an extended vacation that will last several weeks and never call them again. Ignore their calls when they call you.
Don't be fooled by your Bible Study Conductors. They are not your friends.