Liam needs saving, even though he wants to be the savior.
Zayn wants to save him, even though he's the coward.
or
The one where Liam is about to jump off a bridge and Zayn is determined to make him come down.
Zayn's struggling, and he doesn't want to burden anyone, so he keeps it to himself. But, what happens when Liam becomes worried about Zayn? Begging Zayn to let him help him...