"It's when you have deodorant and a spare pair of tights there...."

"... you know you're kinda established" -Richard from work (Qualifications: married man and all round nice guy)

What does it mean if I have a pair of pyjamas, make up remover and a toothbrush there... and planning to move in a dressing gown?
Plus there's all those clothes I left when i repacked at his house- all shoved under his bed (reminds me to bring a large spare bag to London this weekend).

3 weeks is too long.
I wonder if he misses me.

I don't dare ask.