•VERY LONG: Need advice•

Diamond
So there's this guy I've known for years, and we go to the same church. Off and on, he has messed around with a couple other girls and I. He has talked to me on numerous occasions and we've even had phone sex. I saw him yesterday, as I was looking pretty nice and he completely ignored me and made me feel worthless. What should I do after this situation has taken place?
P.S. (Slightly unrelated)
He also has this girl, who will remain unnamed , who has decided she doesn't like me! I walked into our church and apparently started talking about me. This girl is trouble, and likes to start trouble with other girls I think she's threatened by (I'm not sure why though, I'm very nice). I'd better include she had a thing with two guys with a boyfriend and still had the nerve to call me a whore. She didn't say it to my face, however and I'm also wondering what to do about her. I see both of them all next weekend. 
Thanks for getting through my long thing here, I just need some unbiased advice.

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