Hello,first of all are u male,or female and how old are u if I may ask? I ask because usually teenagers have these issues due to their low self-esteem but it can also happen to adults.This thing is more usual in girls/women but men/boys can have that too.I think I got what you mean because I had the same problem with my older best friend when I was 15-16 and our friendship was really unhealthy.It was like an emotional dependency towards her and I became very very clingy.jealously when she used to talk with other ppl,etc.Isn't that you mean?