Wow. Allot of terrible advice in this thread.
First of all, OP, you are terrible. You had no problem manipulating this poor woman into believing that you loved her. That's low. You want to break it off but your conscience won't let you? Congratulations! Now you have to live with that. No matter what you do at this point her heart will be broken, even if you stay with her. Trust me, a relationship based on honor instead of love just can't last.
Time heals all wounds. Come clean with her, BE THERE FOR HER (perhaps explain how you feel sympathetic towards her personal problems,) and let time do it's thing. She'll get over it eventually, and so will you. Life goes on.
I'm still steaming mad at you, OP. But I hope you've learned not to fuck with peoples hearts.