Lunaaa, its hard to let go. Its hard to stop the obsessive behavior you were so used to having when you were with him. I used to do the same thing- check phone conversations and calls, drive to see where he was. Its a hard habit to break- even if your not with him anymore. What you really truely need to concentrate on is yourself.
In the last few weeks i have decided to let go and take care of myself and it has been a huge weight off my shoulders. I have finally realized that i cant control what he does and i have to worry about myself. I realized how crazy i became trying to figure out his every move- i look back now and think wow i was really insane by yelling at him all the time and wondering what he was doing. Hes going to do what he wants- and i have to realize that i have my own life to live. i have to learn how to control my life and my outbursts rather then his. the only person you can control is yourself.