2 years need to break up?

So I am in college and been with my girlfriend for almost two years. I have only been in 3 relationships and this is by far my longest one. I need to break up with her and I don't know exactly how or when to say it. We live together. She has her own place but she has only been staying at my place and I will soon be moving to the other side of the stats after I graduate. I don't know how to break it to her...
2 years need to break up?
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