To Higgins28 .....
I would think, especially if very agreeable to him, for your partner to pursue a psychologist first - but, one who is very comfortable with couples counseling. If the first few sessions alone with the counselor (therapist or psychologist) are beneficial, it may be wise for the two of you to work together with the counselor. Of course, that is up to the counselor.
I have used a counselor for three different situations. One of the situations called for a couples counselor. In my case, after the 5th or 6th session, my partner became a person (to me) that I had not expected or even would have believed before the counseling.
In summary - we tried ... what became clear was it was not going to work between us ... and, seeing that - was the first step in ultimately letting go at a later date. Worst case scenario for me - it made the break-up logical and less painful.
Of course, if it is a medical solution, the counselor should be able to determine that if it is a likelyhood.
Good luck to you.
Prostate cancer spreading, COPD under control, depression fairly OK!