everything changed

people changed and everything changed. they try to change to be better eventhough they can change to something bad. i just wondering why people have change,it sounds stupid but i just wondering. i'm  so glad if some of people around me have changed in postive way. but i'll really sad if one of them throw themselves in negative way. i just can't let my lovely people around me fall in a wrong way,example like this: i had a friend that changed become bad,and then people around her/him can't trust her/him anymore. and she/he was very stubborn,and then i've keep away from her/him. hmmm....i hope i'll never have a problem like this.i have prevent every bad things that can touch person to be bad cause i care with them and i won't let it happen.