Driven
I know you're getting a bit of a rough ride here today, but it's only because we recognise your post from about 4-6 weeks ago. Your situation is very sad and we're trying to give you a bit of tough love for your own sake.
You need to decide what you want, not what this man is willing to give you. If you're happy to continuing on a casual basis, then great. But I'm really not sure why you're so hung up on the word 'girlfriend'. To be 'girlfriend', 'boyfriend' means casual, means you've been seeing each other regularly over some months, have meet each others friends, maybe even family. Could be having sex, or not. Are you meaning a relationship where longer term commitments are discussed - in fact do you mean 'fiancee' as in engaged to be married. Now that's something you would discuss. If a guy called me his girlfriend I wouldn't necessarily bat an eyelid, if I'd been seeing him for 6 months or so.
If you're looking for a greater commitment from this man, you're in for a big disappointment. If he's a 'traditional christian' and you've been having sex, you've broken the cardinal rule of 'no sex before marriage' and you're soiled goods in his eyes. A nice person to spend time with, yes. Even introduce to friends and call you girlfriend, but both he and they will never think of you as 'marriage material'. Yes, he's also broken the rule - but hey he's a man and has needs and anyway the rules don't apply to him.
If your happy to spend time with him and enjoy his company that's grand, but don't read anything into the 'girlfriend' label and don't expect to be promoted to 'fiancee' or 'wife'. If that's what you're looking for, time to move on. You seem a nice person, a little naive and inexperienced in the relationship stakes, so please make the best decision you can and leave this man.
Seriously there's nothing to be confused about - you're a girl, you're a friend, you have sex.
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