When I would obsess (and well I still do at time!) I try to refocus on something else. Sometimes I just tell myself over and over again, let go and let God...
The serenity prayer is also good for this, just keep reciting it until the obsessive thoughts pass. It sounds like you are somewhat addicted to him and need to find some healthy ways of re-directing your thoughts.
Try your best not to give in to the temptation of looking into his phone records. It will only hurt you more as you discovered. I wish there was more I could say to help, but you have to somehow dig deep and fight through this. You can do it!!!
He is not worth the energy spent dwelling on him. He has hurt you emotionally and physically and you are worth so much more than that Lunaaa!
****{HUGS}}}