<human>: Can you provide a brief overview of the text?

Slowly been falling away from my girlfriend internally for a few months now, want to break up because i don't really want a relationship anymore/have grown apart from her/i'm not happy in this relationship. We are both at different unis (1/2 hours apart) and i know deep down i need to do it because im not happy anymore, but i dont know how. She loves me and i dont love her, and she has never done anything wrong, it's just that i dont want a girlfriend anymore and i feel trapped. However i can't muster up the courage to do it because i don't want to break her heart when she's been so good to me. I feel terrible about the whole situation.

She's already started asking about what we're going to do for Christmas but I don't want us to still be going out by then, I feel like i need space and the longer i leave it the worse I am feeling. I feel guilty for feeling this way but I can't help how I feel. 

I'm planning on seeing her this weekend to do it, but if I surprise her by visiting and then break up then I feel the change from happiness to sadness will be too much. If I tell her that I'm coming beforehand because I need to talk, she'll know something is wrong and ask me beforehand whether I'm coming to breakup or not. I don't want to lie to her but I would rather do this all face to face as it's the right thing to do (in this situation).
<bot>: want to break up with girlfriend but I dont know how/what/when to say without breaking her heart. What do I do?