What I don't understand is why he couldn't just say he was infected by meteor rocks? It's not like she wouldn't understand considering she's been infected by it as well and has been attacked by the infected. Nobody would think it was weird and it would get him off the hook.
I was about to say that!! He could have said that a special type of the meteor rocks recently had been discovered and being very close to it made him feel really weird! She knows alot of them by S2 doesnt she? But no!!! Anything to hide that hes an alien blehhh
Why not just say, 'The red meteor rock affected my personality somehow'. No one knows how the meteor rocks work, maybe it does affect certain people differently?