How to break up nicely

I've been with this guy for about a year now and I've just about had enough. We are not officially going out, but we are basically in a non-official-relationship. He is a lovely person, however he is too clingy and emotional, and I really can't tolerate it any longer. As mean as it sounds, I've got bored of a few men easily and he just wants to talk to me everyday and meet up ALL the time. He says things like 'I don't know what I'd do without you'- I am aware in some relationships they like to be dependent on each other, but we are still young and I'm really not keen on the dependancy. The scary thing is that he actually does depend on me for emotional support. His family are very academically strict & career focused and he has no other close women in his life to talk to. This year is also very important for the two of us, getting the right grades etc so it's important we concentrate on what matters. He has said himself in the past that we'd stop this when we're off to Uni, so a relationship between us is definitely not a long term thing anyway. So my question is - how could I break what we have in the nicest way possible and still be friends? Ultimately I don't want to be with him, but I'm not that cold hearted that I'd never speak to him again because he does rely me for emotional support. Any advice would be appreciated! Thanks :) Please keep anon because he has TSR.

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