If a girl hold your gaze, is she interested?

I've been attending this gym for like 2 months now, and there's this girl I can't seem to stop myself from looking at.

The other day I was on the treadmill when she sat in the machine directly in front of me, facing in my direction.

Whenever people sit directly in front of me, I do my best to avoid eye contact, but I couldn't help myself from taking a peak at her.

When I looked at her, our eyes locked, and we held each other's gaze. I turned my head slightly, to break eyes, but when I realized she wasn't breaking eye contact I look back at her again.

She however broke the gaze, looking down and to her left. She stared at the ground below her for a good minute before leaving.

Was she signaling interest or was she staring me down because she caught me looking at her?

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She didn't leave because of me. She was waiting for a guy. She left when he approached her.
If a girl hold your gaze, is she interested?
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