In the very nicest way
Grow a pair & ditch the bitch.
She is clearly a person who doesn't deserve to have "SANE" stamped in mirror/reverse letters on her forehead. It sounds like she will do whatever she can to manipulate you to do exactly what is her whim *at that moment*. So unless the sex is fucking MAGIC (& unless you're a sex addict then it does eventually get old) or you are into masochism (seriously if that's your thing then enjoy it as much as she seems to) then she clearly enjoys having you as a doormat.
FTR: I've had my bunny-boiler - I ended-up deciding that that was the universe telling me exactly what a "healthy relationship" wasn't. The break-up wasn't pretty (mostly on my part) but she eventually got the message.
BTW: After you break up, you don't want to be friends, be clear on that or you may end up having a "friendly-fuck" & then you're back in the loop.
EDIT: Whatever you do, DO YOUR BEST NOT TO IMPREGNATE this woman as then she will have something to hold over you forever. Trust me I have a quite a few mates who are all very good [single/remarried] dads who don't regret having their kids at all but who will attest to that piece of advice.
(Misery McUglywife an attention seeking sociopathic fuckstain., Mon 8 Aug 2011, 10:45, 1 reply)

^What he said.
You might love her, but you've got to love yourself more. And any woman that forces you to get rid of a much-loved pet is clearly a cunt of the highest order.
(The Empress it seems you CAN polish a turd!, Mon 8 Aug 2011, 11:56, closed)