Context: i was just pised cause i sent him such a nice message the night before and i get one from him to natasha . and their text messages seem flirty and annoying . so i start busing to his house to see him anyways and i get there and he s all depressed . at first it hought ti was because i migh thave blown the entire thing out of proportion(cause i texted him back saying how angry i was about getting the wrong text ) but he was depressed because he made the mistake .

Question: What is the reason for them being so angry about him being flirty with Natasha ?
Options:
0. None of the above choices .
1. Because they are in a relationship .
2. Because they are family .
3. Because they have an open relationship .
Answer: 1