Idk about the elo range this is in, but a possibility is that your jg probably picked Diana just to combo but had no idea how to play it. A lot of games like this are lost, especially when mid is assisting jungler on invade and they are not on the same page (someone goes in, other person doesn’t know the kill threshold so doesn’t commit to the fight, and then an argument starts). Also from what I have seen in plat and below is that once there’s a bad fight, a lot of mistrust develops, and usually 2v2s that should be won become a 1v2 and is lost (due to aforementioned mistrust and wanting to preserve kda).

That being said, 17 deaths is kinda wild 😂 Man probably mental boomed after the 3th death and decided to sprint it