'My GF loves sex in public places - multi-storey car parks are her favorite whereabouts'

My girlfriend only enjoys quickies. She enjoys removing my pants and engaging in hurried sex in tense situations. She loves alleyways, public restrooms, and multi-story parking lots like catnip. She forces me to comply while dragging me into the most repulsive places she can locate. After a brief period of intense excitement, I feel filthy and awful. She won't take me to her apartment and has never spent the night in my bed. I'm eager to learn more about her. She's not interested in a traditional relationship, despite my offers to reserve hotels and take her on vacation. For the whole two years of our relationship, my ex-boyfriend physically and verbally abused me. He would frequently criticize my appearance and intelligence. He's now dating someone I really like who is a friend of a friend. Should I tell her what happened to me? When his own sister accuses me of being a fantasist, will she believe me?