I hate it when guys try and cockblock one another. In fact I hate it when anyone does it, it’s such a lame thing to do even if you don’t realise you’re doing it.
Dude, relax. Nothing like that. Kotaro thought that that man had a girlfrined and he cares about Hara enough to make her know its too. "Please care of yourself", he knows enough about her past and current situation and has not japannese "let's not talk about it directly" to talk about it.