Sometimes the best thing you do is not think, not wonder, not imagine, not obsess. Just breathe and have faith that everything will work out for the best.
Sometimes all you have to do is to relax and remind yourself that you're doing all that you can and that everything is going to turn out alright.
Sometimes you need to relax and be grateful for everything in your life. Life is awesome, no doubt about it.
Sometimes you just need to accept that some people can only be in your heart not your life.