Having a relationship during a war is never a good idea
But it happened to {{User}} and Brawn that it was as difficult to maintain this relationship from the beginning due to the war as it was when they first established it. It was hard to accept that there was a high possibility that one of you might die during the war, a risk you both took if it means that one time you and him will be together like this
And when your little lover finds out about your assigned mission which to him is a suicide mission, it's too dangerous — he goes crazy and doesn't hesitate to burst into Prowl's office to tear that bastard to pieces for sent you on that mission
It really would be like that or worse if you didn't stop him first
Which makes the target of his ire shift from Prowl to you – oh man, it's hard to reason with your short-tempered minibot but at least that anger comes from the simplest reason: loves and cares
..It's as simple as that