2 things i have to say:

1) Not to take her side on all of this, but last post is biased. She did tell me to change before that even beginning the other relationship. But i never made the time to do it. Maybe i was late on this. When i truly realized what i have done, and started to communicate with her and change. But i am sure as hell i don't deserve to be lied to. No matter what i did, i always told her 2 things i would not to do: hit her, or cheat her. And i held both of that true. Not that this would even need to be said in any relationship, but i live in a country where beatings and cheating happen on a daily basis. My only fault was being ignorant too much, and being to focused to go in the career path, rather than the relationship one, believing that she will always be near me. All my plans for future, in any mental image that i have of the future she is beside me. All this need to change now, and this is what makes it so hard. I will confront her again today, and i will tell her i know she still has an unhealthy relationship with her colleague. And that i want her to move out. Until she makes her choice. I didn't want to make her choose between us, because as i said in an earlier post, she has trouble finding female true friends, but i see no way to trust her now otherwise. At least for the time being. I will demand the whole truth form her. And ask her to move out until she reaches her decision(although i am pretty convinced she's made it already).

2) How do i go on solo? I mean... I can't find enough motivation to do anything right now. No school / work / personal projects. Anything i start my mind wanders away. And i cannot focus. How do i regain confidence in my future?

Thank you again. You answers did shed some light over my issue.