My friend is flirting with my wife openly

This week’s topic

I have a friend I have known for several years. He has always flirted with my wife openly even in my presence. His affection for her was open, but I dismissed it until he started calling her several times a day sometimes even when he is drunk. Recently, she was admitted in hospital and what I saw raised my antennae.  He went out of his way to visit her every day, bringing her flowers and ice cream. I am starting to feel disrespected but I don’t know how to handle this situation. I want him out of her life, but I also don’t want to appear insecure. Please help me… {Jason}