Is she the right one or should i leave her.?

i had a gf for 5 months she says she loves me im not sure if its true or not.but i know i really have feelings for her. last week i told her i want time for my self to think abotu something and maybe we can go back togather. the reason y i left her was because she lied to me 6 times abitu big and littile things. she also told me that before we went out she use to like to have more then one bf..she said she is not doing it anymore cause she doesnt want to loose me,i ahve a feeling that says she is still doing it.also before we went out in three days oenof her friends that like her took her out to the movies and they kissed for a long time. she said it was by accident.peopel say stuff about her like she is a hoo.. now the qs is should i go back with her or just kill my feelings that ii have for her? and i know its gonna be hard foe me thats y im asking for help.please