Mary:
I don't think they are in love. They seem to be attracted to each other, but also suspicious. She seems a bit scared of his powers, but is even more scared of her "mother". And he is really fascinated/intrigued by why he can interact with her while time travelling. So right now they are both using the other.
They will probably fall for each other, though. Going by the preview for episode 5 that kiss definitely did not leave them cold.
Thanks for the reply! I get it now so they're using each other while being interested but no feelings for now.
I think after the kiss, some feelings will appear between them for sure. I just hope that when he'll learn about her secret, it won't break their relationship.. (wether it's romantic or not)