I assume we’ve broken up

So I haven’t heard from my boyfriend (or my ex) for three days now. We had a row about how I didn’t feel important to him and I just wanted to spend some time with him. He said he had to go as he was going out.

I haven’t heard from him since. He won’t answer my calls. I messaged him asking if he wanted to go for a walk and chat. No reply. I then messaged and said if we are done then just tell me. No reply.

He’s 31 and I’m 20. He’s meant to be the mature one out of us.

I’m not stupid I know it’s over. He’s online just choosing to not talk to me. But who does that to their girlfriend just ignores them. I’m still hoping he’s going to message me with some reason as to why he was busy but I know it’s not going to happen. I feel so heartbroken. I can’t be that awful that he can’t even tell me it’s over.