was she a virgin before she had sex with you ? if she was, then all the talk about feeling guilty about doing something her parents or God do not approve of it might be true.

but if she was not a virgin, probability is that morality of sex is not the issue. she is just falling out of love with you bro.

for most innocent girls, sex only if she loves a guy. if she dun love you no more, say bye bye to sex.