Most Helpful Guy
Break up with him and head off to college, you are not doing him or you any favors by staying together just because you both might be afraid of being alone.
I don't get this being alone is so scary shit... one of the best things you can be in life is on your own and stand on your own two feet!
Being alone is not a bad thing, it is a good thing and makes you get to know who you are without being attached to someones hip!
In order to be a good bf/gf/wife/husband you have to know who you are and who you want to be.
Most Helpful Girl
It would be kinder to be honest with him. That way it gives him the opportunity to find someone who does genuinely want to be with him. He will never find the right person if he is holding onto the wrong one. He is only clinging to a fake promise and false hope. Its cruel to lead him to believe that you feel the same way he does.
Eventually he will sense you don't feel the same way anyone. So even though honesty will hurt him, a lie will destroy his trust. That will be more painful for him, and it'll take him longer to get over