Don't chase people. Be you, do your own thing and work hard. The right people who belong in your life will come to you, and stay.
Your life will get so much better when you realize that it's better to be alone than to chase around people who don't care about you.
Walk away from anything that gives you bad vibes. There is no need to explain or make sense of it. It's your life. Do what makes you happy.
If someone sticks by your side through your worst times, they're the ones who deserve to be with you through your best times.