If you’re using Mike’s presets the likely culprit is the speech volume leveller which will be set for his voice in his environment.
You have two options. One is to put a downward expander in your effects ract before the speech volume leveller to reduce the breathes or the other is to adjust the speech volume leveller levelling amount until you’re happy with the finished sound.
The best way, as had already been said, is to work on the mic technique to reduce breath sounds at source. The worst kind are the snatch breaths because they are both short and sharp. This will take a little while to master.
As I work around I’d suggest putting a downward expander in your chain ahead of the speech volume leveller to reduce the breath sounds and leave the rest of the audio untouched so the speech volume leveller with have much less breath sound to bring up and level while still being able to do its job on levelling the desired part of the audio.