Just move on in your life , stop texting him , find things you enjoy , live your life ... Trust me he is going to notice you don't text and will call or come around.. Let him chase you a bit .. Be busy ... just fake it all if you need too , funny thing is faking stuff like this having a life usually winds up turning into a life . Your son hasn't forgotten you hes is being an adult and spreading his wings ,

Hang in there ! You can handle this