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Breaking up always sucks.
Best way to do it is in person, and be straight. Don't let her reactions get to you. Recognize that you are doing what you are doing because it's the right thing to do and don't let go of that.
And then get out of there as soon as you feel like you've said what needs to be said. The more you try to help her move on, the more you'll prolong her grief.
Oh yea, and be prepared to want her too when you go back to Uni and see that she got over you and is attracting attention from other guys.
If the clingyness bugs you, then you could also try to tell her this and explain that you want a relationship with her, but not to be stuck to her hip all day every day. It's nice to know you're missed, it's another to feel like someone is clinging to your leg like a child who doesn't even want you to go to work.
When feelings are involved, it can be hard to really consider what is actually best for you. Usually it is a bad idea to get back with an ex girlfriend, but it can be just the hardest thing not to get sucked back in.