Not exactly going to become HM's ambassador to China is he.......no, over the top, and he probably feels very guilty. However, there's a big difference between an overt flirt and, say, a grope or, even worse, more.
Let him know your displeasure but bear in mind that there may be occasions, not sexual, that he is bigtime pizzed off with you......the old adage of "lose the battle, win the war" (or sort of!). Go and enjoy your racrochment and enjoy it to the full, both of you......