Search Results: ex boyfriend is calling

We talk on the phone every night (he wants to check up on me everyday and just to talk). Anyway yesterday night I told him "baby ima go to sleep early" and didn't get any response for a while so I decided to put my phone on silent and try to sleep. An hour later, I checked my phone and he gave me a missed call and multiple messages - he sounded quite angry.. in his messages he said this:
"i was sleeping so i didn't get back to u sooner. why didn't u call me instead of messaging me? next time just call!! you couldve woken me up so we can still talk. and you only gave me one sentence without an explanation. how do u think I feel? its so suspicious. you hardly call me. i always call u. i feel like you dont care about me and you never take me seriously. if you can't take me seriously just tell me and i will let you go and find someone who would be serious with me and take me seriously." and then called him to sort it out.
- I hardly call him (I only message him) because in my previous relationship, I used to call my ex at random times and he would tell me off and didn't like me calling him unless I message him first. So that is why Im abit nervous to call my current boyfriend at random times.. i never told him this though
Am I in the wrong here? ? Is he right to be upset?