Chasing people around in life will be of no benefit to you in the long run. This is mostly because you can't make people be who you want them to be, people will always do what they truly want to do, deep down inside. What you can do is make extraordinary effort each day to be you, and to do what is in your heart, and work hard at it.
If people want walk out of my life, they can feel free to. I'm not chasing after something that wants to leave.