Well, better finding out later than never. However, it is not so much of a good thing to not be able to "see" the ill intentions of someone. And, even if you learn a little of social awareness, you still get to find it much later. Do not you not think that, it would be so much better when you first get to know someone, that they would tell you their actual intentions? Even if said intentions cannot be fulfilled (whatever the reason it might be, good or bad), it would save a lot of time, you would know what to expect about that someone, so you would make less mistakes, and more of the right choice, because you can prepare yourself mentally for that, for what is going to happen. You could even avoid said individual directly if that individual truly had a bad intention. But, that is not how people work, unfortunately....But, with that there would be no manipulations, you would not be deceived. No lies. If there were someone blunt, straightforward.
I would have not wanted to go to that prom either. And, yes, it is very bad getting the wrong idea...Being misunderstood....It seems like there was there a lack of acceptance towards yourself. Spreading lies....I think that could have made others to do some other bad things, right?