>run into gorgeous grad student at school weekly-ish for a

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>run into gorgeous grad student at school weekly-ish for a little under a month
>she flirts with me very enthusiastically
>exchange numbers
>suggest coffee via text and she says "Sure!"
>propose a day
>three days later she hasn't replied

Should I just drop this? I feel like anything I say now will seem needy.

Other info:

She wasn't very flirty the day we exchanged numbers, but she was telling me how sick/exhausted she was of her TAship and exams were about to start, so I chalked it up to that.

I didn't text her until the end of the exam period, about a week after we exchanged numbers. Probably my bad there.. I thought I was being considerate since she was so busy.

Her response time was pretty slow before I asked her out (20m to 2h).

I might have a class with her next semester.