Instead of wondering “is everything good here?” about him, ask that question of yourself. Is the relationship meeting YOUR needs? Make sure you have a lot going on in your own life so that you really believe you’ll be okay if it doesn’t work out. I definitely wouldn’t be continuously asking him if things are okay.
But I guess you just have to give it time and see how things evolve. It might just be that he’s not a phone person, or he’s really tired after work, or whatever. How long have you been together?