She cried and said she didn't know why I needed that and told me she never thought she'd be good enough for me.

THis line above is what she said?. It speaks volumes about her insecurities. She is a church girl who had never been intimate before you,who was probably brought up strict,and no matter how well read she is or aware of sexual possibilities,that is a foreign terrain for her. And the fact that you did seek satisfaction somewhere else and expressed your disapproval ,or, say,frustration about her inability to provide full blown sexual feast is putting too much pressure on her,remember that is NEW to her and she needs your trust and slow guidance,not demand. She is like late blooming flower,dont let the frost set in,otherwise it will never bloom,but if you are patient and continue to be caring and understanding(emotionally,physically and verbally), she will bloom into beautiful flower one of a kind and make you the happiest man. Remember ,some of big wars were started with simple word,that is how potent word can be,and also love is patient,forgiving, giving and accepting
good luck