<human>: Can you provide a brief rundown of the text in within 3 sentences?

The guy I like is 32 M. He and I have flirted and we have good chemistry. Recently, at an event this girl saw me and said, "Every time I see her, she gets on my nerves" to one of her friends. I'm not a dramatic person and I don't surround myself with people who are negative.

I do not even know who she is. So she followed me around the whole night... I found it creepy and quite stalkerish. She entered into the group I was talking to and started aggressively asking everyone who they are and what company they are from. She waywardedly asked everyone, looking at me and them randomly asking people and gave me a look. I left the group and excused myself. Then she followed me into the same after-show meeting room. There were several rooms she could have gone into. I don't know how to handle this situation, I feel like she's scheming to do something to hurt me or my reputation. She actively messaged my crush on a public media site the very next day. I turned my social media accounts private, because I'm sure this is how she discovered me and that I like my guy. How do I deal with this situation and I like my crush very much and think of him seriously.
<bot>: Girl who I don't know is trying to compete with me and now is going after my crush. How do I deal with this situation in a flawless and mature way and still let my crush know how I feel for him?