Explanation of the movie...

Hi,

I've just watched the movie and I found it quite interesting, but I didn't fully understand it and I would love someone to tell me points of view or explanations about it, please. Your own interpretation.

My questions (with spoilers) are:
1. Why Beñat sent flowers to Ane? Why he kept her necklace?
2. What did Ane think about it all after discovering/thinking it was him?
3. Did Lourdes ever know what Ane meant to Beñat?
4. What was Ane talking about when she explains it was a dark period of her life (the time she left flowers in the road, etc.)?
5. Why Lourdes didn't want to keep the ashes?