salaam allaykyum brother Ahmed, I hope you wont be minding me wiritng in English, as I live in the states and at my work place there isnt Arabic keyboard and I hope my words can be reached to the right place and that I make some sense.

When divorce occurs later in life, it is usually the result of couples growing apart over the time, or it involves a couple that never really belonged together in the first place
Generally speaking, most people initially try to work to improve their marriage, but if little comes of such efforts, most people eventually give up trying. Instead, they simply wait for the right time to come, often leaving a spouse by surprise. And more often than not, it is the woman who decides to leave.

From the sound of your question ,is it possible that your wife made the decision to leave the relationship a long time ago, and you are just now having to deal with her decision?

If you had to look back on your relationship - how do you think she viewed it
Unfortunately, if your wife has been planning this for a long time, then there is probably little you can do to change her mind.

Your wife may or may not be se**** someone else, but in either case, that is most likely not the real issue.

Based on her lack of wanting any contact with you, it may be as simple as this: Your wife isn’t interested in b**** in a relationship with you anymore.

When marriages fail people often spend their time looking for alternative explanations because the simplest explanation is too painful to acknowlee.
I hope I might have made my point.
Its about time you foucs on your school and studies, those are your main goal at this moment. leave every bad memories aside dont dig for the past as it might bring you unwanted memories. This a new semster started with a a warm welcome and who knows like the rest said she will definately suffer for what she's done. but thats not your case let ALLAH take his actions, and we are all here and would be glade to help in any ways