I think she’s with him for the press and the self-actualization aspects of this. She finally gets to be famous and admired, like she has always wanted.
When she’s getting that self-actualization (Nottingham, the wedding, now), she’s happy with him and looks “in love.” When she’s not getting it (her family messing things up and whatever happened when her mom visited her) she’s angry and is no longer “in love.” He’s a conduit to her self-actualization.