That is one possible interpretation. Another possible interpretation is that she was in the process of breaking up with Bourdain, and the t-Shirt that said "Fuck Everyone" with the added caption "You know who you are" was directed at him, at Bourdain.
This interpretation is supported by the Daily Mail story about Asia Argento cavorting around Rome with another man. Celebrating Harvey's downfall: Asia Argento embraces writer who shared her speech attacking Weinstein for using Cannes as his 'hunting ground', as pair stroll through Rome. Was this the story that caused Anthony Bourdain to fall into his final depressive state and kill himself?
Let's go to the backstory. Anthony was twice married, the first time he married his high-school sweetheart, then he married a hot Italian-American waitress, also much younger than him, who was featured on many episodes of his show. That wife became very involved in the martial arts (eventually encouraging Anthony to take up jujitsu on his own). And, she equally obviously began cheating on Anthony with a number of much younger, more virile and macho fighters that she was training with. Eventually they divorced, but not until she had (perhaps with little malice intended) humiliated him by publicly cuckolding him.
Flash forward 5 years. Your new girlfriend, who you were happily enjoying time with a week ago jets off to Rome. A day later you see pictures of her with another man in the press. You are a well worn 62 years, your girlfriend a still hot 42 year old acress, the man she is pictured with a very handsome 28 year old. Once again you are losing the woman you love to a younger, hipper, more attractive man. Once again you are being humiliated by this fact in public. You call and confront her. She's tired of you, you exchange words, and hang up. She posts an enigmatic photo on her Instagram feed, but it bears unmistakable sybolism for you: the picture of the shirt is Sid Vicious, someone you have always admired, part of your distant punk-rock youth. Sid, who also killed himself.
Just Friends?
Celebrating Harvey's arrest? Or is it a bit more than that now?
How would you feel if you saw this picture of your wife or girlfriend with another guy?
Two friends out for a walk?
Argento and Anthony a week ago, in Florence
How would you feel seeing your girlfriend in this picture?
"I love you too"
Who as this image and caption directed to? Harvey? Bourdain? Someone else?