Really appreciate the wisdom people, anyone else reading please continue to chip in.

There's a few questions of how can I believe her and how do I know it's the truth. Obviously I cannot be sure but in the 6 months that we were together serious, she was always faithful to me whilst we was together and never lied, the reason I believe everything she says is because she always brings to me what happened and has not attempted to hide anything so far. For example when she phoned me about her mistake, she could have easily kept that from me but decided to tell me. I do have trust in what she is saying as bad as it sounds.

Next point is like I said in the original post is that I feel I have painted a very bad picture of her. Her reasoning for the coldness and the lack of emotion with the whole situation was that she didn't want to hurt me and didn't want to hurt herself. Ofcourse everything that she has done wasn't the best way to handle things. But I genuinely believe that none of this was intentional, selfish yes ofcourse but I don't think she intended to hurt me the way she did.

She's still here for around 10 days and we live in the same block, so although I think the no contact resolution is most logical, I feel like I won't be able to help myself until she has left for 4 months. I told her earlier today before I posted this to come and see me tonight when she's home if she cares to try and figure out what we are doing. If she turns up, I guess I'll give her the chance to work towards the finishing on good terms with all the effort being unforced and then going with the 'No Contact' over summer once we've left it at that and see how the situation is in the next semester. If she doesn't turn up I guess I'll go straight for the no contact as hard as it is.

Obviously since I still feel something there I'm straight to defend her on different things and make excuses for her and maybe that's my problem. Anyway continue to let me know what you think