She feels she made a mistake in Marrying you. Whatever her reasons........
......YOU need to understand that a person has stated that they do not want you.
......YOU need to understand that you are not respecting yourself by chasing after a person that states openly that she does not want to be with you.
There are Millions and Billions of females on the planet. You will do yourself a huge favor by leaving this one alone and finding one that "wants" to be with you and that will treat you fairly.
Trust me on this, You have no kids....you have no possessions together that a court will have to divide...it is a clean break....count this as a blessing and move on.
You are 25.....it only gets worse with her from here on out......find a healthy one.....but wait a few more years before marrying again. At 25 you hardly know yourself.....there is plenty of time to discover who you are and what kind of woman is best suited for you.