ok you are getting confused because you are so close to them and since you know that it is not love then you are on the right way. now starting from the beginning, you are so close to them and can't be away from them. ok it is kind of complicated friendship. and i understand, when you feel you are so close to someone and he is so close to you mentally then you can't even think you maybe live a way from him. so, the right thing to do is to follow a schedule even this may look weird but i think it is the right way. now how?
let's say you meet them twice a day, once in the college and once after college, for 5 days a week. and arrange something together to hang out in the week end. remember it is an example, so bear with me please

. then make a schedule like the following:
for 2 weeks: meet them everyday in the college, 3 times a week after college, and in the week end.
the next 2 week: meet them everyday in college, 2 times a week after college, and in the week end.
the next 2 week: meet them everyday in college, 1 times a week after college, and in the week end.
the next 2 week: meet them everyday in college, no more meetings after college, and in the week end.
the next 2 week: meet them everyday in college, no more meetings after college, and no more meeting in the week end.
now you should stick of this schedule for a month to get used to it and now you have a normal relationship with them. from now on, you could arrange something to see them after college or in the week end, but don't over do it or you will return from where you began.
what will help you follow this schedule is meeting new friends or calling old friends and arrange something with them, or get a new girl friend

or visit your family, do new activities ..ect. i mean anything that keep your mind busy, hope this will help and good luck.