What's a good conversation starter?

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Hey guys! So Its been so long since I've even talked to a guy who's been interested in me. been out of the game and feel so rusty! some guy and I exchanged numbers the other day. I've never been the kind of person who believes the guy should always be the first one to text since he was clearly interested enough to approach me and ask for my number. Despite that somehow I'm drawing a blank and really want to text him but dont know what to say besides hey. Any good conversation starters?(: