Can you help me find the title of this Old French movie?

Ok, so I remember watching this movie when I was younger and I have forgotten the name.

What I remember of the plot however, is that there is a woman who is shy and quiet who works in this store, maybe a candy store or flower store. Anyways, some dude on a motorcycle comes in one day and starts to court her... she's super shy and doesn't open up very fast. The go riding on his motorcycle and I think they go swimming in a public bath. She eventually falls in love with this dude towards the end and changes into a not shy person who is all about this guy.

Well at the end they drive into a field... I think they have sex and then he murders her and then rides off... end credits.

Help please.