How to flirt through texts?

Hey guys! I'm a 19F who met a 21M on a night out. We talked for like an hour and I really liked him. The problem is that he was a foreigner and ended up coming back to his country and I never saw him again. I got his social media that night and we started talking! How can I let him know that I'm interested without scaring him? I already sent him some flirty messages but idk if he's not interested or if he didn't get them :/