Imagine there are two best guy friends, Jake and Bob. Bob has a crush on a girl, Rose, who is already dating someone else. They are all high school students.
Bob follows her around everywhere and works a part time job at the same place that she does. But he never says a word to her and doesn't even try to talk to her in a friendly manner let alone confess to her because he is trying to be respectful towards her.
Jake notices him looking at Rose and asks if he has a crush on her but Bob denies it. Jake repeats his question many times over several days but Bob continues to deny that he has any feelings for the girl.
Rose is unaware of Bob's feelings and has no idea he even exists. They work at the same place but they have never interacted in any way. She didn't even know he was studying at the same school as her.
Jake also has an interest in Rose and since Bob won't admit to his feelings, he decides to make a move on her even though he knows she is dating another guy.
Now Rose herself is having second thoughts about her relationship with her boyfriend; she doesn't care for him much and wants to break off but is unsure how to do it.
When Jake approaches her, she is uncomfortable but she doesn't put up any boundaries between herself and him. In an act of impulse and maybe some lust, Jake decides to kiss Rose and she doesn't refuse him.
Eventually, she breaks off with her boyfriend and starts dating Jake instead, unaware of Bob's feelings who backs out and refuses to fight his friend for his crush.
Now, my question is: was Jake wrong in making a move on Rose knowing his friend liked her or even that she was dating someone already?
This is the plot of a show I recently watched, and I have been torn about it ever since and can't get it off my mind so I would really love to know others opinions about the situation and what if this happened in a real life setting?