Try another option.

Bottling things up can make matters worse for some people.

Employers who have some options for workers to get help in a confidential manner can be quite helpful.

Try another option.

If Mick does not mention he has made a complaint, no-one will be the wiser.

Although this is a possibility, there may be a more positive reason for Richard saying to Mick "keep this to yourself".

Good answer.

Containment of the complaint is essential to achieving a good outcome.

'Leakages' would make Richard's chances of resolving the problem more difficult.