a lot of things. sometimes for the better, sometimes for the worse, but you see, you learn from everything and you grow from mistakes you've made and whatever has happened in your past, you'll become more wiser making that also change and be for the good.

As you grow older, you lose people you thought you would know forever, things start to make more sense and you start planning and sorting your own life out. 

DONT WORRY  about people who mess you around or leave you unexpectedly, chances are, you'll gain better friends and people in your life that will help you grow more as a person. 

Sometimes you feel lost and confused about things that change, but if you look at it and keep positive you'll see that in the long run, it happened for a reason and was for the best. 

I often see, people upset for days because they lost someone who meant so much to them, but I say to myself (for the people who have left my life) they were meant to leave, they wasn't meant to come with you into your future, you'll meet better people who help you see things in a better perspective. you'll become more wiser and not let the same thing happen again because you would of learnt from before.