Harkonn3n said:
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And there are quite a few Escapist Sages willing to lend their wisdom...
We do our best.
Anyway, there could be a whole host of reasons for this sudden withdrawal of affection. You describe yourself as being a gentleman, very giving and so on. There could be a hint of guilt, or the feeling of you smothering her with affection, and that has the appearance of her not wanting you. Also there could be the problem of things getting stale. Has your life become routine? Are you doing the same things day in, day out?
I don't believe in these 'shit tests'. If a woman is doing that to you, then she doesn't trust you and thus doesn't deserve you, I don't think that is the case here.
Anyway, you don't want to give up on your relationship, obviously, and you can't go on as you are, but there are a few things you can try before you give up completely.
You mention that the affection thing has become one sided. This could mean that you're trying to make up for her lack of affection by lavishing her with yours. This can be smothering, so try to limit it a bit. Think before you tell her you love her, if you've told her a few times, then she might get sick of hearing it. I know it sounds odd, but if she is feeling oddly cold within herself then your affection will be making her feel guilty and thus resentful of you making her feel guilty, inadvertently (Still with me? Good.) So back off a bit, but make sure she knows that you're there for her.
Also if you have become stuck in a routine, then try and break that, if only temporarily. Take her out spontaneously, if you don't very often, even if it's just for a walk in the park or something. Doing a few things a bit differently could refresh things a bit for both of you.
If you take my advice and after a while nothing has changed at all, then you will have to discuss your feelings. If she is unwilling to make the effort then you might have to go your separate ways. It's not nice to think about but she might have lost her affection for you and is trying to spare you the heartache. I hope this isn't the case and that you can get this relationship back on track. Good luck friend.