I can understand the behavior of the main character if he is on the route of Chick. An insecure and sentimental hero would also have run away to cry to other girls and ran away from them the whole episode. A DIK hero wouldn't do that.
OMFG... In my view you've got that abso-fucking-lutely backwards.
Yes, I agree that the 'DIK hero' might stay. And he'd make thing
much worse.
Confusion, fear (of losing *both* them in one fell swoop), etc. Emotions running very high.
And the natural human response to those emotions is to get
aggressive.
He'd almost certainly point fingers, shout, accuse, insult, etc. (This
is a
Dick hero, remember?)
In short, he'd say a bunch of mean shit that there's no coming back from. Any hope of salvaging any form of relationship with either of them would be gone.
When you
know your temper is about to make the situation worse, withdrawing to calm-the-fuck-down is not 'insecure'.
It's just plain smart.
Getting away, and staying away, until he'd calmed down and had a chance 'to process'. To deal with the situation in a respectful manner.
That showed a good deal of maturity on the MCs part.