You're right. Finding out your live-in boyfriend was cheating on you is huge. Which is exactly why she was probably obsessing on getting home to him. Completely normal female behavior IMO, regardless of the direction their relationship was headed. I've broken up with guys but been madly jealous when they start dating another person. Human nature IMO.
I think the reason we haven't heard anything about his cheating ways months later is either (a) because it wasn't true or (b) it is irrelevant to the case. I'm leaning more in favor of b.
I respectfully disagree with your comment on Hunter treated like the dutiful BF. Maybe in the beginning, but if you watch the more recent interviews with Jonni and Anna, that certainly isn't the case. And he's been crucified on here since day one.
LE hasn't said much about HF other than his drug arrest is a completely separate case. Yes, LE has issued a lot of false statements, but at this point, I'm not seeing much to dispute that right now other than the fact HF has spent a good deal in county jails since Christina went missing. May (or may not) just be a sad coincidence. MOO.
O/T - JMOM...if you buy that I'll throw the Golden Gate in, too.