The guy does not have to say anything if does not feel like it! He has no
obligation to Ani314 or anyone! He can just walk away like he been doing!
I do not think Ani314 should keeping on talking to him if he had walked away from her already. The guy has made clear he not in the mood to talk to her.
Some guys just do not like made any scene in public! You said she should keep talking to him and I disagree!