In Germany, couples don't start with formal dating either and it's only after a series of informal meetings – walks, dinner, cinema, theatre – that they might start being seen as a ‘couple'.
If you're interested in someone, maintain eye contact – if you aren't, don't.
If you say ‘no' to an invitation, he may well think you're playing hard to get and will probably persist.
A French man or Spaniard might tell you he loves you after only a few weeks but don't panic: It usually just means ‘I really like you'.
Women can say it back to a man with the same meaning – it doesn't mean you should be moving in together or planning a wedding any time soon.
But the rule almost everywhere else in Europe is: don't.