potential life changing move?!

So recently I went away on holiday to Paris, I went by myself as a kind of relaxing treat from my family. I am currently single after a quite messy break up about a month ago. I was seeing the sights and doing so work for my art mainly there. On the 3rd day of the 9 days I was there I met a guy in a cafe. He was a local from Paris and was really nice he offered to show me some more of the sights in Paris and I agreed seen as I wasn't very good at locating my way around. So after a day of sight seeing and getting to know him he offered to take me out for a meal the next evening, I agreed and he was planning to pick me up and all that stuff. So the next day when he picked me up he got me a bouquet of flowers and took me out for s really nice meal. We saw each other over the next couple of days and he made things quite fast like he planned for me to meet his whole family and said I love very quickly. I told him I had to leave in a matter of days and he was really upset by this and we promised to keep in contact. He told me the other day that he wanted to move to London so we could be together because he loves me and stuff, I really don't know how to react to this because I really like him and he is attractive, funny and clever but I can't help but feel worried that if he does move to London and it doesn't work out because it was only meant to be a short term thing that he would have made this massive mistake because of me. I just need help in general! I want to know what to say and if this sort of behaviour is normal of a guy / French guy. Thank you :)

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