More than that.
Seeing the message notification Sam came to the realization that he had messed up on another front. He had spent the night having sex with a woman while he was in a relationship with another one. He cheated, in other words.
This wasn't something like playing with the Valkyries, which aren't even human. Not only did he sleep with Alice, he had also tried to purposefully impregnate her. And as if that wasn't bad enough the feelings he had for his childhood friend, which he thought had died long ago, were now back and he was sure he has fallen for her once more.
Realizing he now has feelings for two women at the same time Sam began to panic. Obviously there is no way to keep them both at the same time, expecting that is just idiotic. He would have to choose between them eventually.