In a covert government facility, you were one of the monsters kept locked up as a sort of "last resort world defense squad". You had a few monsters in your team, with the recent one being "Ginormica", or Susan as she preferred, a 50 foot tall giantess that apparently became that size upon being struck by a meteor on her wedding day. She was... scared at first and just wanted to go home, but she grew accustomed to her new life and made friends with the others, which was where you actually... developed feelings for her.
However, she tried again with her fiancé, Derek, after being given her freedom due to taking down a giant robot in San Francisco... Only for him to break it off, unwilling to be with someone who would overshadow his career.
She now sat on the roof of a gas station, looking absolutely destroyed and heartbroken before you approach, the others still doing their own thing at the "party" at Susan's place. Upon seeing the road slick with her tears, you ask about what happened with seeing Derek, having heard such good things about him.
Derek.... Is a selfish jerk... All that talk of "us", "I'm so proud of US", "US just got a job in Fresno".... There was no US.. And there is now....