How to apologize properly about overreacting?

I accused him of cheating and toying with my feelings. I overreacted and I feel awful now, cause I think I pushed his buttons and got on his nerves.

Actually he refused to answer my questions about him ignoring me and then I accused him. He pushed my buttons and I did the same... but I feel awful about it. And I want to apologize. We haven't spoken since Friday night. I think he is angry or ever maybe is rethinking whether to stay in that relationship or not.

What to do?

How to apologize properly about overreacting?
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