There's no point in consistently worrying about everything. What will happen will happen regardless. So breath, look on the bright side. Have some laughs, fall in love, accept what you can't change, and carry on. To actually live is courageous. Most People exist.
Don't be flattered that he misses you. He should miss you. However, he's still the same person who broke your heart. Remember, the oly reason he can miss you is because he's choosing, every day, NOT TO BE WITH YOU. (so you shouldn't be missing him.
Twenty years from now you will be more disappointed by the things that you didn't do than by the ones you did do. So throw off the bowlines, sail away from safe harbor, catch trade winds in your sails.