They Are out to get me

Ok long story short, a girl from work got sacked they looked at her emails and found emails from me to her on the company email address, now they are after me on that as well as me having to be a software dev, we have no notice at logon that are email or system is being monitored, the person in question went to this girls inbox and went thought the emails and seen the ones from me were do i sand on this.