If you have to talk to him, keep it strictly professional.
The Sun
Insist it was a one-off for you too - you prefer more serious relationships and believe in keeping the workplace strictly professional.
The Sun
But he quickly added that he meant it in a strictly professional sense.
The Sun
Tell him clearly that you want your relationship to be strictly professional.
The Sun
Tell the work guy your relationship will be strictly professional from now on.
The Sun