Me [19 M/F] with my girlfriend [19 F] 1 year, she got a crush on another guy and now wants alone time

As a quick disclaimer, I always feel inadequate around her and it ends up fueling fears way out of proportion. This event already being big (to me) and also being blown up by my brain may be messing with my thoughts.

So my girlfriend and I just celebrated our 1 year anniversary and everything up until then has been wonderful. The anniversary itself however went quite a bit further south due to some glaring problems I should have either caught or a last second scheduling error that almost overran the day we celebrated. I feel like she still had fun regardless, but it feels like the beginning of the end for me.

The day after, I go to a convention in Vegas while she stays at her home doing work and otherwise hanging out with her friends and coworkers. Kept in contact through text for the 4 or so days we were apart before we met up in Reno on vacation with her family. She felt kinda distant then, but due to a couple of factors like how we're never really romantic in front of her parents or something leaking, I simply chalked it up to it being the wrong time. Other than that, we had a blast at Reno I feel like.

Come back home, settle in for a couple of days, and then I wanted to go back to business as usual where we would hang or go out all day...but she wants to be alone. Alright, 3 whole days sharing a hotel room with her parents with a drainage problem, she can have all the time in the world. Another day goes by, another day she wants to be alone. I get in a call with her that evening and she tells me the news, she thinks one of her ex-coworkers is cute and they have similar interests, she has a crush on him. Aww man.

She tells me that she still loves me and that she'll cut off contact with the dude. Chest still hurts and motivation is fried, but at the very least she was honest with me and nipped the bud before it became anything serious. She still wants alone time to work it out.

Gears begin spinning, of course given that I worry. She's been working at her current place for nearly a month and she caught that guy just before he quit, and it wasn't like a crush will form in the two days we just got back from Reno. She wasn't distant because parents or kool aid, she was distant because she was already mulling over her crush. Probably. And then there's the lukewarm anniversary, and then I think of all the ways I disappoint her, and then I worry over the distance between us. It's been more than half a week of continuous worry for me and I just need some advice on what I can or should do right now.

tl;dr: My girlfriend got a crush on an ex-coworker and wants alone time. Is there anything I can or should do in the meantime?