Ok so I'll start off with a little background: I met this girl about two years ago.
we became friends right of the bat but that was part of the problem at first.
I was best-friend-zoned for about a year as she went through multiple bf's.
After about a year and 2 months she was single and suddenly took an interest in me.
her interest was caused because she got jealous of another girl who was hitting on me and thought she couldn't stand it if i was with someone else.
She was attracted for about a month before i asked her out. we went out for about 5 months.
during those months we were great together, happy as could be. After a while she just started ignoring me.
for no reason at all she wouldnt talk to me wouldnt text wouldnt even look at me.
so i decided to use no contact to pull her back. it worked. she came back after a month apologizing for her stupidity.
i let her come back and we were fine again for two weeks.
during those two weeks she showed tons and tons of attraction. but after those two weeks had passed she started ignoring me again.
I tried to talk to her about it twice and both times she wouldnt answer but just kept ignoring me.
I still saw her at church every sunday but she clearly made an effort to stay as far from me as possible.
she has been ignoring me with extreme prejudice ever since (four months).
every sunday if i even come near her she frowns and walks as far away as possible.
My questions are: where in the world did i mess up?
why is she so prejudiced instead of indifferent towards me?
and MOST IMPORTANTLY how do i Get Her Back?? i really care for her and even after 4 months i dont care for anyone else!
please help! any advice would be incredibly appreciated! thanks so much for reading and helping!

Why do you care so much about her when she clearly doesn't give a fuck about you?

If I had to hazard a guess, she uses you as a fallback plan when things screw up with other guys she would rather be with. She ignored you for four months and you just sat back and waited for her patiently like a military wife?

This is exactly what you don't want to hear; drop her.

I think you mean ex-gf. She is a terrible girl who uses men until she is bored and moves on without even having the grace to let you know she is moving on. MOVE ON MAN

She's not your girlfriend anymore. We are the best in the world! We don't stick around to tolerate such shit! If she won't give you the attention that you deserve then fuck it, she doesn't deserve you!

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Aint no other option... The Best or Nothing!

Mrbird, please make an effort to get over this girl and move on in life! There are so many women out there it is crazy.
It is incredible to see how into this girl you must be to hang around her for that long. But it sounds to me like this chick is one of "them".

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Self respect is far, far more important than a momentary sexual experience