He is consistent only for a few days, then goes back to his usual self. Why is that?

We got back together, I thought he would put more effort and he really did for like 4 days. Then stopped keeping his promises again. And even blamed me for being petty and that he has promised many things to many people.

I suggested he might be with someone at home that's why he can't call. He went crazy and said he is going to block me if I tell him this thing again.

Now he said... that I'm going to be punished and he won't contact me will he decides if even.

He is consistent only for a few days, then goes back to his usual self. Why is that?
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