She's not a "genuine person" she's a flawed character. Jessa is not someone who has anyone's back. She will sleep with her employer, sleep with her girlfriend's exes or one night stands. She will go to rehab and sleep with the old guy. Sex matters much more to her than friendship or relationships.

Uhm, she went to the Moth and talked about it? She also wrote a Modern Love Column about it? Hannah told the whole fucking world.

I think in some twisted way Jessa does care about Hannah, but she's just so stunted she couldn't talk about it. Jessa is a shitty friend but not because of Adam.

Yeah, but… Jessa was a shitty friend! Remember that she abandoned Hannah in upstate New York and left a post it note.