Should I be worried about her?

I have been seeing this guy for a little while now, and we aren’t in a relationship. We’re just dating casually, but he says he likes me a lot and wants something more. Well there is this girl that he is in constant contact with, they have a 1,000 day streak on Snapchat, and talk from the moment they wake up to when they fall asleep. I don’t know what about because I don’t want to be that girl that is looking over his shoulder all of the time.

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