There's no way for you to know. It's a far cry from what the real world is like, where people generally treat other people with honesty and openness, instead of the transparent misdirection afforded a child. Again, I'm sorry to reinforce your existing worries, but I think age and your corresponding position as "student" allows them to feel no moral qualms about leaving you in the dark. It's especially true of the older professors and administrators, I've noticed, and part of being a scientist is a healthy disregard of authority.
The folks who treated you right are worth keeping around, and you'll remember which ones they are veryyyyy naturally. I'm sure you're a great teacher, but if I watched you lecture, I'd probably just end up feeling even more stupid than I do currently. Man, I wish I could be there to see what happens to them when they try to break you, in graduate school. I predict that the ordeal will end with them making an ass of themselves, and of course you'll emerge unscathed. Take pictures!
Edit: and yeah, in this instance, you don't need to go through them to lecture. Just set up sessions without directly involving the school, if people are interested. You should teach, it's the best way to learn.