To disappear completely just because you are addicted to someone is a bad and coward way to react, you are fooling yourself and making the other person feel bad. You should learn to accept that the other person also has things that he has to take care of like you sometimes may have. That is part of life. Just because the other person is busy with something does not mean that he does not care. You should not come to a conclusion that he / she is trying to avoid you. If the other person is busy with things in his / her life and you just leave him / her just because you feel attached to this person’s company, what do you think that he/she might feel, don’t you think that he/she might feel left behind. You are being selfish to think only for your feeling, do you think that this other person is very happy to loose a friend, after all you say you felt good in his/her company, which means he/she also has been in your company. Tell the other person not to come too close and you should not do that either, you should respect his/her boundaries and he/she should respect yours. Learn to accept the fact that you both have different things in life to do, guide your feelings somewhere else and use each other for consultants. Consulting to each other and respecting each other’s way of life and consults, leads you both to a better friendship. But just completely ignoring and leaving the other person will make both you and the other person sad in a way, But of course the choice is yours, we all have to make our own choices and live with it. But the best way to keep your feelings away from him/her is to guide your feelings somewhere else and keep your self busy in other things that interest you most. ;)