Kirsten had begged him to hire Hailey.
Kirsten had given him the "She's trying really hard, all she needs is someone to believe in her." Speech, he had fallen for it hook, line and sinker, he can never say no to Kirsten and after all Hailey is family.
Now Hailey is kissing him.
It's late, sometime after midnight and she had being hanging around after closing, ostensibly to help, but now she is kissing him and it turns out she is pretty hard to no to as well.
He doesn't understand why he can't push her away, it's not because he wants to hurt Kirsten, that is the last thing he wants, she is hurting enough right now.
It is more that Kirsten is pushing him away, disappearing into herself, it is more that he is desperate to feel someone, anyone touch him.
He isn't pushing her away.
He is begging for more.
Hailey is more than willing to comply.
He can't help but think she had planned this.