It should be easy for Nina to love Logan. After all, he loves her wholeheartedly and he hasn't broken her heart before.
Liam Cipher is not used to being in love. Every time he closes his eyes, all he sees is her face. It is maddening, his urge to possess the one woman who would not give him the time of day. He knows he hurt her before, but he wants her back.
Logan... well, Logan is not opposed to sharing.