Why do I want to talk to him so badly?

A guy who I guess is my friend I really want to message him so badly, but I don't feel I should as it looks like I'm needy and clingy and I don't want him to think I'm like that anymore, I've only had him on Snapchat for a week and I haven't messaged him first, but he's messaged me, what do i do cause I wanna talk to him so badly?
Why do I want to talk to him so badly?
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