Being straight forward with girls rarely works. Indirectly confess and the surprise usually gets them. The last girl i got together with, i pissed her off by teasing her and not telling her what I actually said. We worked together at a lab so she looked funny wearing so much safety gear. I fessed up about what I said and i slipped in that i enjoy spending time with her. Send your own signals. Sending a straight forward "I like you" would boost a girl's ego and you'll become and option. If you give them the sense that you're intrigued they like the challenge of drawing you in.
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