Hi Jasmine,
It is unlikely that he is interested in you merely because you have noticed that he playfully throws things at you.
Being that you are his ex, he may be really fond of you and incredibly comfortable around you.
Now that the pressure is off and the both of you aren’t in a relationship anymore, he may feel as though he can just have fun with you like he would a guy buddy of his.
The fact that the both of you don’t text much would indicate that he may not think about you all that much whenever he is not around you physically.
This would further indicate that he isn’t interested in you romantically.