Nevertheless, it's totally acceptable to reach out to him once or two times to ask what's up. If he hasn't responded to your text in 3 days or he stated he would call and never ever did, shoot him an easy and casual and playful text. I would personally drop it if you don't get a response a 2nd time. Stay casual about it — if you send out a mad, demanding text right away, he's definitely not going to answer.