If a girl doesn't break eye contact, does it mean she is into me?

I have been practicing to become more confident and one of the things I do is that I am trying to have eye contact with girls on the street. Girls always break the eye contact (I don't know if it's a good thing), but a few days ago, there was a girl that didn't break eye contact and kept looking at me until we went past each other. She didn't smile, her face was in a neutral state. What does this mean? Honestly, it looked a little bit intimidating and for the first time, I broke the eye contact first lol.
If a girl doesn't break eye contact, does it mean she is into me?
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