Attractive men never flirt with just one girl
As far as other girls liking him, think about it. If he's a good catch, and your into him, it's safe to say that other girls probably feel the same.
If you dont wanna take the initiative, just be flirty then. Make a lot of eye-contact. When he catches you looking at him, dont look away right away, give him a smile after looking him in the eye, then break eye contact. Every guy on earth thinks that if a girl smiles at him, they wanna sleep with him, use it to your advantage =P
When your talking to him, make small talk, but make it about him. Ask him questions about stuff you dont know, but want too, make him feel important. Ask him what his hobies and interests are, ask him what he likes to do AFTER Church/Work. Thats a totall easy way in for him to ask you out, without you having to ask him. You gotta help em out sometimes.
Give him compliments, thats super important. Invide his personal space a little bit when your talking. You know how it is, people we dont wanna deal with we stand farther away from, so get a little closer to him. Not like up on him or anything, but maybe just a 1/2 a step closer than your normally would.
I personally like teasing guys i'm into. Especially if there people i know as friends first. They usually tease me back. Nothing mean or anything. Just playful teasing that makes people laugh.
You can also flirt with other guys you know, when you know he can see you. Make him jealous. If your never flirting with anyone else, it just tells him your 100% avail, and he can take his sweet time, cuz you'll still be waiting (especially if he knows you like him).