Ok - taking a step back for a moment (and taking my thoughts off Lillian so apolgies if I get this wrong), but bunnies, like hoomans, can have off days. They are simbient, emotional beings, intelligent and developed. They might not be vocalised, but they communicate effectively within groups. They can and do have mood changes. It might be to do with the weather - the pressure outside? It might feel muggy for Dillon and don't forget bunnies have to be in tune with nature - they rely on it.
So Dillon may just be reflecting something he feels outside of the relationship - not necessarily to do with the relationship or you.
If his demeanour is normal and he's not agressive and eating ok and happy to be with his gorgeous wife-bun, then maybe Dillon is just having a day off.
Hopefully tomorrow is a new day and I hope he is feeling more Dillon-ish in the morning.