Sometimes all you can do is not think, not wonder, not imagine, not obsess. Just breathe and have faith that everything will work out FOR THE BEST. The best collection of quotes and sayings for every situation in life.
This is true in relationships and also pertains to moving, having to say goodbye to family and friends, making a career change, saying goodbye to old habits/lifestyles,etc. Be Brave enough to say goodbye and life will reward you with a new hello :)
Just hang on for tomorrow. Just because today is a terrible day doesn't mean tomorrow won't be THE BEST DAY OF YOUR LIFE. You Just gotta get there. Hebrews Jesus who is the same God forever, will NEVER forsake you, no matter how you feel.