The first impresion of Abby is what doesn't sit well with a lot of people. (mild spoilers) This man just saved her life. As soon as she realizes that this is Joel Miller, the guy she's been looking for all this time, any decent person would hesitate, feel comflicted, or doubtul,. Because they want us to symphatize with her , right?
And in the end if she really needed to not let him go, at least let the guy know why you're doing this, and make it quick. After all, he didn't torture anybody to saved Ellie, and he just saved your life.