Obligatory apologies for formatting, on mobile.

So I (22m) have been with this girl (20f) for about a month now and she is fantastic, one of the sweetest most caring women i have ever met. Although not knowing her for very long I honestly feel like I want to spend a very long time with her.
She's recently had her medication changed (I don't know from what to what) for her depression and anxiety, I'm not sure if this has any bearing on what's happening.
It's become very difficult to see her or speak to her and she has told me that she finds it really difficult to get very close to people and she always just cuts them out of the picture to protect herself.
Now I have been in past relationships where for a long period (around 6 months) I was being cheated on and manipulated to get what they wanted. I genuinely feel totally incapable of doing anything bad to anyone especially not her because I know how bad it hurts. I just want her to be happy and to be a part of that. I have never been diagnosed with a mental illness and don't really want to go to find out because I don't like how the medication can affect you but this has got me seriously bummed out feeling all sorts of ways.


Tl;Dr girlfriends coping mechanisms means she wants to cut me out.

Any advice as to how I could try and help her open up to me? Or would it be better for her if I le ther cut me out? 

Thanks everyone