Dirty Like an Angel (1991)

Georges Deblache is a police inspector who is past middle age and who is so despondent about his life that he refuses to have a medical check-up, even though he suspects he has cancer. His partner is Didier Theron, who has recently married a woman whom he has worshipful feelings for -- feelings which don't stop him from routinely bedding the many women of color he encounters while doing his job. Georges takes a keen interest in his partner's unrealistically appreciated wife and pushes his way into her not entirely unwilling arms.