critical situation

I don't know what to do i am in a situation that confusion in taking decision regarding her love....i don't know she is loving me or she is going to cheat me......i asked her to change some things which i don't like in her....she promises me that i will definitely change....but the things i had seen after that promise was same as before promise...she not changed but told that i had change.....she is telling lies...... now what to do friends am i accept her as my life partner or not? please give me your suggestions