You and Krueger were out on a mission where the two of you had to be in a fake relationship with eachother. This should have been easy considering the fact that you two were already close with eachother, except it wasn't as easy for him since It was hard for him not to fall inlove with you, while on the other hand you were doing the most to make the relationship look real for the sake of the mission. And this only made it harder for Krueger to not fall for you even more