Questions: Dating

I turn 29 soon. I never had a girlfriend. I want a teen girlfriend. Legal age of course.

This all started at a 5-day convention a year ago, followed by 2 more each of these lasting a weekend, held by some EU history university faculties. Right after we first saw each other we held our gazes on each other noticeably longer than usual. Soon after that, she came to stand next to me, in a group I was already with, and I tried to talk to her but it was difficult as her stuttering and nervousness was quite bad. Sometimes when walking past me she would turn her head towards me and stare at me while she walked into another direction. During presentations at all 3 conventions where we met and at break times she'd regularly stare, hold her gaze at me or glance over towards me several times. She only stutters and becomes tense with me.

I'm a guy, we're both history students with an interest in labor history. She lives in Austria, and she knows, since we first met, that I live in Sweden. She seems introverted, and tends to stick with people from her own faculty. Yet, she consistently has this behavior I described earlier to just me, and at every convention she also takes initiative to come and talk with me, and when she doesn't tense up or stutter, she smiles at me too.

However, she also does seem to give signals of seemingly disinterest like she doesn't respond to most of my chat messages, she only wrote me that she's the worst at chatting which she wrote me after I complimented her appearance of her selfie in a story post. That was before our most recent convention in last April, but her behavior during this convention seemed unchanged and similar to before, ie still stuttering and tense with only me but walks over to talk with me with a smile. She also regularly still held her gaze at me during presentations and break times. Later, when we had a bit of small talk she suddenly walked away from me, but while walking away from me she turned her head to me and kept looking at me.

The next time I will likely see her is in 4 weeks at a convention lasting a week.

I keep it as a memory of her. I don’t want to forget her or forget what she looked like.
I never got the chance to ever see her in person but we would talk on the phone for hours and hours. She told me she had lost feelings for me which is a lie. She actually met another guy most likely. She won’t ever come back again. I deleted everything about her. All I have is a picture of her. Well, a little more than that I decided to keep.
I have two pictures and a video.

*that is not her in the photo by the way.

So they can have a taste of their own medicine?