Should i break up with her for lying?

Iv'e been dating this girl for a little over a year, and it was amazing at first, But then it all turned bad. You see, i wanted to keep this girl so i decided to tell her a secret of mine about two months into the relationship. I told her because i knew it would not last another month if i didn't. it would make everything horrible trust me. So she said she believed me, and then i told her all about it, so many things, that now i wish i would've just kept to myself, and not have even dated to begin with. She always said she believed what i said, but i wanted the god's honest truth. I texted her and said "look i need to know if you believe me when i tell you (my secret) i need to know" She replied a simple no. the conversation carried on a bit after. She kept it from me from the beginning, and all that i told her was just a waste of breath. My secret understandably sounds fake, but i even showed her, well to an extent, not the full thing out of fear of her thinking i'm some monster. She also cheated on me, maybe more than i know i just overheard a conversation. Relationships are supposed to be about trust, and i don't feel a spark like i used to, i don't feel as attracted, and in the same day i found out that she lied to me for a year and cheated on me, so based on this information what do you think, leave her or stay, i still love her, but....I just don't feel it now that this has happened. I'm sorry for the lack of information, but i hope you understand.