During the Werewolf Event you must Choose Logan thats where you get his first heart if you dont you are unable to get it anymore.
It doesn't. After you get Logan back, you can get a heart with him. You can also get hearts from Bernard after you get him back too. The first heart with Bernard you can get with 40 like (I think, it might be a little bit more) and you get the option to sleep in the same bed when in the cabin thingy.
(bad explanation, I know lol)