Originally Posted by
Jiro
Post Sephiroth though, Cloud loses his trout and gets hyper depressed. There's nothing pushing him forward any more (I don't mean JENOVA cells), so all that adrenaline falls away and he gets angsty at failing his one job in protecting Aerith. That doesn't necessarily mean he is romantically attuned to Aerith, only the guilt over letting a friend die.
The kicker is that he leaves Tifa and the kids. He takes this protective role, and it's a pseudo-family, but then he gets complacent or whatever, and has to get out. It could be primarily caused by the guilt, or maybe his feelings weren't strong enough.