Text to his ex after breakup

1 month after breakup he text one of his ex. They dated 3 month . We had emotionally intence relationship, physical connection, talked about our fears, he was trusting me, he said i am reason he started to work on himself and liked me for everything i am. But after breakup he text his ex, did our relationship mean anythin for him? Was i used as rebound? Or filler?