Ooh, this is a good idea! Ask him to dinner at a restaurant! (I recommend a walk along the South Bank afterwards, v.romantic.) At least if you act on it, you'll know either way and won't feel so powerless?

I looked up Ocean's 12 on youtube out of curiousity, hehe.

(And don't know if you realise this is public? Just in case you're as paranoid as I am.)