The start

Things are starting to happen that the characters themselves simply cannot explain. Things that they do instinctively and when they finally realize that they have don it, there is no room for explanation. This is something like Robert finding himself running after Edna in chapter ten when she is walking back home. He has no explanation of why he ran except for the fact that he wanted to make sure that she was not afraid of getting home safely or if she would rather go with company. But why running? He has not yet described any emotions that are even close to love. He may have denied it in his talk with Adéle but this is good enough evidence that there is something happening in his head that will develop into love even if he does not know it yet. And this could be one of the most dangerous aspect of love: he has a suspicion that it's there but knows not when it will suddenly come up and bite him.

Edna is at a different stage of love in chapter ten. We know that Robert took Adéle's advice in distancing himself from Edna. She may not know this, but feels that distance happen and goes on into simply having a bad time at the shore. That is when Robert finds regret and proving the idea that his love is starting to develop. But Edna does not really take it easy. This is a part of the book where a love can and will give out another set of feelings. Edna simply felt excluded but at the same time with a developing love over Robert and when he came to accompany her home, she tried to reject it. But she did so in a more soft manner than expected. Most people would have simply walked faster to get away. But she stayed behind which means she still has hopes of getting something out of the possible love.