How do I talk or approach a guy that I like?

he smiles at me and stares at me but i just don’t know if he fully likes me. we are friends which is nice and i want the friendship to grow on and see where the rest goes. how can i talk to him more or text him more than i usually do? cause we don’t text often but we do text sometimes. i also don’t want to ruin the friendship by me having a bit of feelings for him.
How do I talk or approach a guy that I like?
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