Heraklia has an interesting thesis here, one that cannot lightly be dismissed.

As I said before, Antony is a very complex character. He might not have given any importance to the conspiracy and thought it wasn't worth bothering Caesar with. We don't know what he was told about it or by whom. Caesar apparently did not "act" on conspiracies except to denounce them publicly.

On the other hand, Antony as traitor does fit in, and if you have in mind Cicero's famous "Cui bono?", he did benefit by becoming, for a while, the most powerful man in Rome.

By the way, he would be proconsul of Macedonia the following year, and Macedonia seems a good base from which to support Caesar's Parthian campaign in several ways.

Another question: apparently Caesar was going to install Dolabella as joint consul with Antony. The two men apparently hated each other for personal and political reasons, and Antony had challenged Dolabella's election. Another strange decision of Caesar's! It can be argued that each man would check the other - but isn't that the worst way to get things done?