Stop focusing on 'not focusing' on them being gone. If you keep looking for that moment you aren't thinking about them anymore... then you will never get over them.
Take a chance... try to find the good things about your new found freedom. Do some things you have been wanting to do... but relationship constraints or time constraints kept you from doing. Make this into as much of a positive experience as you can. Go to a park, hang out with friends, invite someone to a restaurant you've been curious about, drive around town just for sight-seeing, take up a new hobby, reconnect with old friends you haven't heard from in years... whatever you do, do something new and different.
Rearrange your bedroom... so that part of the familiarity will disappear. Move your bed to a different location --- enjoy the bit of disorientation in the morning. The reminder that things are different, but it isn't necessarily a bad thing. Pile the pillows close to you... they will provide the comfort you seek as you sleep.
Everything has changed for you now... stop pining for the old and embrace the change. The world hasn't changed... good things can still be found... but you'll miss such opportunities if you keep yourself occupied with what once was. As they say --- there isn't any future in the past.
"The weakest soul, knowing its own weakness, and believing this truth that strength can only be developed by effort and practice, will, thus believing, at once begin to exert itself, and, adding effort to effort, patience to patience, and strength to strength, will never cease to develop, and will at last grow divinely strong."
- James Allen