My boyfriend always ghosts me after an argument until I apologise, once it lasted a week

DEAR DEIDRE: WHENEVER I fall out with my boyfriend, he cuts off all contact until I apologise.

We’re both 20. It started just after we met.

We fell out over something stupid at college, and he ignored me for a week.

I thought he’d dumped me, but he messaged me again like nothing had happened.

Now he does it every time we disagree or I say something he doesn’t like.

My mum caught me crying about it, and she says it’s “stonewalling”.

Is it bad?